Just don't take the baits ok!
Things are quite peaceful right now so let's just leave it at that. Say everyone just ignore him for 30 days and see how boring and desperate he can be, wouldn't that be fun !
Of course he is going to keep calling people names and unfortunately Admin so far has been on his side so unless you want to keep registering??
Ignore, ignore, ignore will be the best reply!
And if he keep attacking while everyone stays silenced . I'm sure Admin will act accordingly.