The really really big problem with the internet is it's anonymity.
It turns a lot of people into idiots -- whether they're on forums, in games, or anything else they can interact with.
If you were in real life playing cricket with a load of strangers one hot Sunday afternoon and one says 'OMG You failz fag learn to bat noob lolol' - and another one switched the ball so he's blatently cheating, you'd hit them with the bat, break their respective young noses, and they wouldn't do it again. It's called 'society'. On t'net we just have to put up with all the rubbish so the kiddies keep doing it and not learning a thing about respect.
First thing when I'm Prime Minister I'd ban is the anonymity of it all ..