Why are people on forums so rude?

[Katria]

Well basically, on any forum I go to...these people are always so rude and strict. They always act like smart asses and have sooo much rules.
Especially utaforum.net. I use that quite a lot, but the people on there a really rude and it seems they lack humour.
I mean they'd probably be a completely different person if they were to talk on Facebook, YouTube etc. I mean people on forums are so much different to people on other websites. Why are they like this?
They don't act like that at all.
They act like all stuck-up and snobby. You can make one mistake and they will beat you up about it.