Like
@Breadbassket said, the South is more conservative, not necessarily in the sense of any coherent political ideology (it was actually a driving force behind the New Deal, look at who sat on those committees rubber-stamping FDR's shit) but in more of a psychological and cultural sense. There is a long-standing tradition in the Northeast (not so much the rest of the country) of hating Southerners as ancestral enemies (even from the earliest days of the colonies New England Yankees were in love with themselves and demonized others as backwards, regardless of it had any reality to it) and in the present day the South is the embodiment of everything Libshits hate. Mind that New England (which would go on to settle the Great Lakes coasts, the West Coast, Hawaii) was founded by Puritan Anglo-Saxon stock, Virginia and the Carolinas by Cavalier Norman stock, the Mountains by Presbyterian Scottish stock.
That's all it comes down to, in the end. Sectarian rivalry and ideological warfare. If the South was filled with atheists and Leftists Hollywood would love it.
A big chunk of New England/Leftism's resentment is focused especially on that the South has tended to (again, conservative) uphold the ideals of Jeffersonian democracy and Madisonian constitutionalism in contrast to Hamiltonianism. This isn't always strictly true but it is generally true. The South has tended to stand for local autonomy (states rights, which contrary to modern dogma included far more than just slavery, though slavery was the driving force behind the War, and which never went away) an opposition to large centralized institutions.
Remember, Adams played the dictator (jailing his opponents and wanting to be called His Excellency). Hamilton wanted a King and essentially British institutions in the US. It was Jefferson and Madison, Virginians, who stood against that. They would also dominate the early Republic and the Hamiltonian Yankees never forgave them for it.
If you are a Progressive, for whom the State is God, then that makes these people your number one enemy. The South could contentedly share a country with the North as long as it did not feel threatened. The reverse is not true because it's in a Yankee's nature to want to seek dominance over others. All that changes is what shitty ideology they push.
The South also serves a useful role as scapegoat. It can both serve as this sort of embodiment of everything wrong with America for self-flagellating Cultural Revolution bullshit, insincere displays of contrition, while at the same time being a way for the Yankee to distance himself from his own guilt. It's like a Schrodingers cat thing. The South is simultaneously the cause of all evil and is no different from the rest of the country depending on the rhetorical purposes of the person speaking. In reality racism was a severe problem in the North both before and after the War, and race relations are considerably worse there today.
In the South people made law that subjugated Blacks, but the law was law. In the North there was no law, but people discriminated voluntarily. I find it hard to say which is morally worse. In the North they bled to free slaves and voted to give rights to Blacks only to exclude and riot when the Blacks naively expected the same treatment up there. Not in my backyard. Northerners loved Blacks as a theoretical concept and hated them as people. Southerners loved Blacks as possessions and hated them as equals.
The people who I find friendliest to genuine Southern culture actually tend to be old school labor movement Communists and other radical socialists, because they've put in the effort to understand Appalachia, the Deep Southern yeomanry and they tend to value folk culture which the South (rural, conservative) had more of.
Lastly, Jews (specifically, the third wave, the Eastern European ones that settled the big Northern cities during the Gilded Age) in particular seem to have a rabid hatred of the South. It's absolutely bizarre, but the way I've interpreted it is that when their shitty Polack/Russian ancestors stepped off the boat in New York City they just mentally equated the rural, fervently Evangelical Southern people as the closest equivalent to serfs and Cossacks and set about actively undermining them as a defense. This against a people who had historically been their greatest friends in the country and still idolize them (disgustingly) to this day.
I have generally believed that one of the crucial flaws of the United States is that it paired together two cultures (Deep South and New England) that were so diametrically opposed, virulent and vicious that they could never live under one roof in harmony. The other root stock of the country - independent and wild Appalachia, statesmanlike Chesapeake Bay/Tidewater and the cosmopolitan/pluralistic and individualistic Delaware Bay and NYC areas - were capable of living under a union lead by either, though at extremes one would chafe (the Quaker's society under the Deep South, the Appalachians under New England). To have those two together, though, was toxic.
The Deep South was eventually smote enough times that its spirit and ideal was broken and it more or less adopted the ethos (even, to a large extent, the accent) of Appalachia. New England was never smote and it just got nastier and nastier as it moved from victory to victory. If you want to fix the country you need to burn down Boston and San Francisco and kill half the population of Massachusetts.
A good introduction to my worldview would be something like
Born Fighting: How the Scots-Irish Made America. Near the end of that book (I don't seem to have saved a particular passage) it gets to the heart of it.
As far as media goes, I'd say it got more toxic and unhinged as Leftism itself got more toxic and unhinged. The country had achieved a sort of regional detente around 1910 at the expense of greater racial strife. That was the bargain, the South and the North adopted each other's ugliness, for a time, so they could get along, and it was the Blacks that paid the price. It was during that time that much of that old media was made, though there was also a big trend of a sort of Southern chic in the 1970s were the hippie types actually really liked Southern culture (I guess because Civil Rights had passed, so it was now quaint and folksy instead of mean and sinister). This changed.
The Andy Griffith Show is a really good authentic portrayal of Appalachian Southern life in the 1950s. The accents are all correct and the tempo and tone of life is correct. Being set in a fictionalized version of Griffith's hometown (Mount Airy) race isn't relevant to it.
My dream, and I think it will come very soon, is that Blacks and White Southerners will realize that they were the same culture all along. There's a famous quote about race relations being more fraught but intimate in the South. Segregation has been over for 60 years (practically a lifetime) and rural Blacks strike me as largely comfortable and contented. I see Blacks eating with local yokels in the diners, going to the same Pentecostal churches, fishing and riding ATVs like rednecks, breeding mulatto kids.
To me the most constructive way forward is to recognize that we were both manipulated by evil aristocracies, from both sections of the country, against our shared interests. One can hate the Confederacy and love the South because the Confederacy and the system it represented was a mass psychosis that brought the South nothing but suffering. It was, like the Soviet experience in Russia, the Nazi experience in Germany, or many other such tragedies, the symptom of a people who had strayed from their spiritual foundations, and I believe it, as it exists today, is more aligned with what the Founding Fathers would have wanted than it was in the world of plantations and hoop skirts.
In the end I also expect the Mexicans will be at home here, too. There are genuinely troubling problems with this mass immigration. I think most of it comes from a lack of discipline on them, some of it may come from specific kinds of immigrants (like deranged Venezuelan and El Salvadoran gangbangers). But Mexicans and Guatemalans, who were the bulk until recently, are quickly becoming an Evangelical/Pentecostal people. It is hard to explain without just listing random junk, but my gut feeling is that a Mexican-Southern synthesis will get the same results in the rest of the South that it did in Texas. Which is to say Texans, which would please me greatly.
I would like for Southern nationalists to move beyond the Confederacy, although I know it will never happen. The CSA killed Southern nationalism as it forever saddled it with its baggage. I've come to recognize a flag that I can love as an alternative. It's the Gadsden flag. It was used in Revolutionary South Carolina. Is very relevant to modern issues and represents the South at its finest, that moment when Virginia had the world by its heartstrings. I want this to be the flag of any modern secessionist movement. I say the South, but there is really no reason to want to exclude any Western or Ohio River state that would like to join.
I've thought a lot about names, too. Names depend a lot on the exact borders. In the end, I see an American secessionist movement as either being Southland or Heartland. Dixie is too antiquated, people in the Upper South have no affection for it, it has too much baggage. Southland is earthy, fitting to the spirit. Heartland especially I like for a more inclusive interpretation. From the Oregon backcountry to Pittsburgh, we're all Heartlanders. Wouldn't this be a fine flag for it?