It’s not Alliance players they’re annoyed with, it’s whiny people.
I’ve been Alliance since Day 1 and played a bit of Horde, and it’s very easy to see how both sides have been shafted in their own way. I’ll still support the Alliance for getting things especially in terms of how bad of a deal they got with things like mechagnomes. But some Alliance players act as if they’ve been personally victimized by Blizzard and no one finds it cute.