I would ban them all. You for intentionally antagonizing people, and them for "go kill yourself". Perma ban. Maybe 7, 30, perma. Maybe. Just until people started getting the message.
I know it's a pipe dream. Might not be economically feasible. But in some instances I think it would be. WoW could probably pull it off, some people would even re-sub. COD could pull it off. They already paid for the game. Some might even buy it again. Otherwise if they get banned from COD 14, they can wait until COD 15 and see if they matured any.
Facebook could pull it off. Free-to-play games can pull it off. Eventually people would get tired of having to make a new account and find all their friends again. "Hey Joe Public, can you please message John Private for me and tell him to friend me, because I was a loudmouth asshole again".
I'd perma ban everyone until people learned how to speak again. Of course I don't have economic invenstment in it, so it's easy for me to say that I don't think it would be a huge economic loss.
Also it's not funny. It's not the basis of most comedy, it's barely the basis of some comedy. Comedy is funny. It's an art. It's a skill. Sure it pokes fun of people at times. Artfully and skillfully with great comedic timing. This bullshit is just distracting. It's almost exactly like when a kid gets up and tells his teacher to "fuckoff and die"... and the class laughs. It wasn't funny, it wasn't clever, it wasn't anything. If was one person being an asshole and everyone else laughing nervously.
Unfortunately a couple people actually do think it was funny. Then they do it. People need to learn. That you could even compare it to George Carlin shows that people need to learn. Perma bans for everyone.