>>4
Maybe they do realize it all but also realize that it's all part of the social game.
Just like sex, it's primal and simple but it can be justified in the most elaborate ways but ultimately comes down to 'I want to do it so I'm going to'. Some people want to hate or bully and they'll do it despite what elaborate or simple reasons they have. And then if I'm accused of being a hypocrite for fighting bullying with bullying, I just say I do it because I want to.
You can always find a reason to bitch and go against someone else, that's the way the universe is setup. Conflict, competition, challenge, etc is an innate aspect of the physical properties of the universe; it's something deeper that's manifested from simple universal laws to human behavior.
tl;dr, haters gonna hate.