I know that I’ve been influenced too heavily by such controversial characters as apazhe and mrparker.
Nevertheless, there is quite a lot to be learned from their sometimes inhumane behavior. For example, if someone on LiveJournal bans people and deletes comments, the diagnosis is almost always obvious. The same goes for someone who tries to explain to the other person what they actually meant, attributing to their words nonexistent motives born of a sick imagination.
The list could go on for a long time. The main thing, really, is not to end up on it yourself.