There's no real good way to justify his actions and words without lying through your teeth.
I'm not saying it's good to defend yourself without justifiable points, what I'm saying is that most people do it on the interent, I don't see why you guys keep trying to argue with him, he won't stop defending himself until he himself realizes what a moron he was acting like.
Or you guys are being trolled by him and you think he's a moron and he's really just messing with you guys.
Troll or not you should just ignore him, you guys, and OP.