I guess it's cause Alberta has a bad reputation within Canada because of branding. Alberta is seen as a hick place that got lucky with its oil and shits over the environment and infested with neo-cons who are happy to bend over for oil (this last part is true) Alberta plays into the hick culture a little bit despite being massively urbanized and having the youngest population in Canada. Alberta and Western Canada in general also has a massive victim complex. It's pretty rightfully earned but that doesn't make it any easier to listen to. Especially when it's the province that makes the most money by the landslide and its people make the most money and pay the least taxes while still endlessly bitching. Which is because Canada doesn't have an electoral collage (You Americans and everyone else who has one should be thankful every single day) and more than half of the population is in Quebec and Ontario and the rest of it is thinnly spread everywhere else and British Columbia. Basically imagine if California, Washington, and New York voters were the only one who mattered. And that nearly every single federal policy was tailored to them but applied everywhere regardless, even if its to their detriment and it makes no sense. That's what it's like to vote in Canada.
Basically in a country that is primarily left-of-center leaning you have a province that has a reputation for being filled with boomer neo-cons hicks who endlessly complain about everything. Inspite of having it the best out of anyone because of dirty energy while you green energy good do-ers are scraping by and make about half of what Alberta does. If you hate Alberta, that's the perception of it and it leaks into some people in the province too and they grow up to resent it. This isn't common sentiment but in the Americanized Canadians who largely live on the coasts and fight online in retarded culture wars, the perception of Albera represents everything wrong about modern society whilst having it better than them. Even if they're retards I don't blame them for thinking that way when Alberta so far hasn't really made any attempts to change anyone's minds and has one of the worst provincal governments in recent memory right now that's a bunch of neo-con shitters. It's a very nuanced topic that I don't wanna shit up this thread with any further. But Canadian politics and relations are every interesting (Last term's government was left wing and getting into trade wars with neighoring British Columbia who had the exact same left wing party in power)