I can't speak for anyone else, but that's not why I hate Kansas fans. I hate Kansas fans because they're so entitled, they'll be obnoxious during the game and do their "rock chalk" chant if they win, but don't stick around to take crap if they lose, and because they refuse to see that they get the benefit of the doubt on so many calls. The refs favor Kansas. But you really don't hear Kansas fans admit that. Instead, they try to argue that they're treated just like everyone else.
You having what we want has nothing to do with it. In all of the teams who have been a part of the big 12, there are only two fan bases I've hated. Kansas basketball fans, and Nebraska football fans, and in both of those cases it's because they're obnoxious
And they boo all the time. Even when they are winning. Stupid Boohawks.