Shut up, loser.
the next time someone does that to you just ask them if they hate everyone or just themselves. Or tell them if they changed their diaper they might be in a better mood. It's usually an insecuity/immaturity thing.
To make themselves feel better. For some reason, certain people gain pleasure from others short-comings, or what they may view as short-comings.
It is a lack of respect and confidence on their part.
Because of their own issues, whether they realise it or not. When you're REALLY feeling good about yourself, you don't need to try and make others feel bad.
cos people dont think before they speak or do things
Because it makes them feel better about themselves.
Seems to me that if you put people down, you must be doing it because you think you're better and more important than them...or at least you need to think that.