It's not that big a windmill to tilt at. Both Ernest Adams' column and the Extra Credits episode give several easy fixes for problems like this.
Easy to say, for sure (Adams' is annoying to read with the snark) but I'm not a fan of enforced politeness all that much. But as Gorgon stated, you'll be trying to make a place where people are both anonymous and relatively safe from any retribution to be a civil space. Rather uphill challenge, it'll probably happen eventually though.
I'm not sold on it being anonymous. I have no problems with my name being visible, or at least available in some way. RealID hasn't impacted me in the slightest. I use my real name on social media like Facebook and it doesn't matter to me. As for "forced politeness", I'm not saying everyone has to be polite, I don't care if someone calls me a **** in a game, but discrimination and harrassment are another thing entirely.
Well is anonymous now, and on most online games you're just a handle (not sure how things are on the console side). The article by Adams seemed to have that aura of enforced civility where you have to 'earn' a right to speak or get fined for 'bad' (defined by who..) behaviour.
EDIT: And doesn't it bother anyone that the people speak out against this get attacked? Other than simple threats, Youtube videos on the subject get reported as terrorism, the website Gamers Against Bigotry has gotten hacked several times. Gamasutra runs all of Ernest Adams' Designer's Notebook columns but got cold feet on this one simply because of the violent way gamers react to this subject. The feminist gamer who announced a series about the subject became the subject of a game where the entire purpose was to beat the woman up. This is literally people being opressed.
Hm, yeah kind of. Some people on the internet seem to have crappy parents or weren't beaten enough as children, heh.
I have to admit the whole "earn the right to speak" idea is one idea that doesn't sit well with me. It strikes me as "guilty until proven innocent", plus I'm assuming that most people who don't have an agenda to push won't bother anyway.