Well, yes. What part of "volunteer work" don't they get?

Or how about "you want another story? Write one yourself!"

These people are probably twelve, of course ...

I think there's no reason you should host anything that makes you uncomfortable. It doesn't have to be profane to be venomous. But what a shame that you have to waste time hesitating, thinking about it, and seeing it gumming up your site ...

Any way you can ban people who do this more than once?