everything is life is a competition to some people, if you have a story to tell, they want to tell one better....if they don't have one, they'll make one up. That and i think a bunch of these young'ns think they are "one of the best rappers in the bay once they get their chance" so they think everyone else is week.
If you haven't noticed, most of the people are doods. testostorone causes this problem too. everyone wants to be on top, i guess talking down on someone else gives you a feeling of being higher than everyone.
but the main reason is......it's almost as if this isn't real life, and people can talk poop on here and not get their ass beat for it.