I think for some of these wacky folks, our board is one of the few meaningful social relationships they have. Yes, a dysfunctional relationship, but it's something.
I used to think that anonymity alone simply brought out the "douchebag" in otherwise "normal" people. But some individuals clearly transcend simple rudeness and occupy "an alternate reality" of their own.
Think of it: modern technology has allowed us to spend more time with clinically deranged individuals than we would otherwise have had the pleasure of interacting with.
Progress.