Hot Water,
Yes, that was another trait; if he made a statement purporting to be fact and someone ever corrected him on it he would either get all sarcastic on you and others or flat out blow his top. In either case, he would hardly ever refuse to admit he was wrong. It's as if he absolutely couldn't stand being corrected. Oh yeah, he would also deny provoking anyone and would openly threaten to report people to the webmaster as well as always being cryptic with some of his sources of information.
There are a few other patterns he shows that make him easy to spot whenever he returns, including but not limited to, not taking a hint whenever he's been booted off the previous time.