Because they secretly feel inferior to others.
usually because we ARE.....no, like Inominitrix said
They like making people feel bad and like the power trip feeling.
because nobody has proven that they are way better than them in something...
Because they are very insecure about themselves. My sister would prance around, trying to put me in my place or trying to shame me. She probably had the biggest superiority complex of anyone I know.
Because in any society you get the bossy ones that want to take control
Because when we are at our secret illuminati meetings they stress the need to lead by example (*secret handshake and obscure gestures* directed to the ones in the know ... you know who you are)
Because they were inferior, otherwise people would not wonder why.
Maybe in some cases they are??
OTOH, there are people who have a woefully inferior intellect. These people need to be ridiculed as a means to motivate them to learn to think and spell.
I do not pretend to be superior, as others have suggested, as an ego boost for myself, I do it because I am deeply ashamed to be the same species as some of these people, and they need someone to point out hey are sub-normal, and they should do something about it.
It's human nature. It's very difficult to perceive things other than our own perception. We are the centre of our world and it's very easy to allow yourself to belive that what you think is right, I mean obviously your not going to disagree with yourself. It actually takes a lot of effort to truely try to see things from someone else's view.
Depends on what you actually mean by that.