Honestly, having been BAFFLED by this at one point myself; it all became *depressingly* clear when I realized that (ironically, given that these are generally people who INSIST that they're "materialists") it's mostly about aesthetics. They prefer the *aesthetics* of the Right.
The 'social left' so overwhelmingly won so much of the "culture war" over the last 30-40 years that with rare exception you basically CAN'T ascend culturally in artistic, literary, academic and other "refined" spaces as a conservative - it's like fish trying to breathe air...
...(IMO that's just societal evolution at work, Natural Selection leaving the social-right and god-botherers back in the dark ages where they belong, but w/e) and thus the "liberal aesthetic" in the West has become interchangeable with the "cosmopolitan intellectual" aesthetic...
...even (especially?) among those who can't necessarily afford the full range of consumable aesthetic signifiers.
Me, I don't really think that's a big deal. It's not my aesthetic even if it IS my "people" intellectually/philosophically; but I accept that things "trend"...
...but what I came to realize is that the "left" contingent that HATES this - while they'll FIND a set of reasons to reject or look askew at that scene... more often than not, they just can't stand the "vibe" on a MUCH deeper level than policy...
...they HATE - deep, visceral bigotry level hate - the whole "liberal miasma" of like Oprah and NPR and museum gallery totes bags and pop-songs about Feminism and intersectionality and societal/technological betterment and smart people solving problems...
...and above all else, they hate the notion that some "liberals" dont accept that The Work can/should be accomplished through intellectual means, like adults.
Whereas The Right? SURE, it's mostly Nazis - but they're ALL IN on that fun grimy "cool party bro"...
...blue-collar dipshit aesthetic that the Old Left just REFUSES to let go of as it's obsolete North Star. Plus, they won't ask you to be a good person - in fact, nice people SUCK, bruh!

So they try to build (sheesh...) a "Dirtbag Left" that had the Right's "fuck all you triggered snowflakes who won't let me, a white man, say the N word!" energy but on The Left - and then they're SHOCKED when it just turns into a swamp for NazBols and Strasserites to spawn from.
Or, put more succinctly: Liberals, for all their faults, challenged the "Left" to become better (on race, gender, civil rights, etc)
...and the ones who hate them MORE than The Right are ones who failed to measure up. The washouts.
/end