Probably because most of it is true, but on a milder degree.
Yes we have the rich oil companies and fucking oceans of cows and wheat, no provincial tax and some pretty shit-brained politicians. Edmonton and Calgary hate each other because both of our hockey teams suck, one has a massive mall and the other has stampede. The cities are surrounded by spots of little run down hick towns full of environment-trashing rednecks that spit, swear and drink their lives away. The bigger cities sort of get into the cowboy spirit, but its more like "Yeah wooh! Western culture...cows, horses, booze.....okay people lets get back to work now."
And to top it off, its cold as fuck here - forget what everyone else tells you its like 8 months of winter here, I shit you not. We have had snow in june and august before.
No it's not perfect, yes there are some serious assholes here and yes, we are very rich. But you have to remember every province or state has its quirks and flaws, and you can't always generalize, because there are some really nice people here. Also - if you're going to vacation somewhere, you probably shouldn't come here, there really isnt much worth seeing. Nice place to live though :)
The number one past time of Albertans is working, when they aren't working they are usually getting drunk. This is due to there being absolutely nothing else to do in Alberta. Other provinces hate Alberta for its wealth and general arrogant attitude, but often sympathize with them afterwards when they realized what a mundane place it is to live in.
Guy #1: That guy is a dick! And I think he's drunk.
Guy #2: You would be drunk too if you had to live there.
Some guy: Ontario!
Albertan: Your a stupid fuck!