I would say the trolling of what he labels dumb Eels fans (or similar wording) came well before any good natured return fire (hardly vitriol) that deservedly goes his way. Read any match day thread after full-time to see how the cycle actually commences.
I read those threads all the time.
It usually goes something like this:
Random Parra fan: "Player X is so shit. I can't believe he's even out there, he's reserve grade quality. BA is an idiot!"
Pou: "Actually if you look at these stats which I will gladly post for you it proves that he's a decent first grader."
Random Parra fan: "Shut up you f**king idiot, you don't know shit!"
Pou: "Well I've given you the stats to prove it, what have you got merkin?"
Random Parra fan: "I've got my eyes and I can see."
Pou: "Wel you're just as stupid as the rest of these idiots then."
Rinse and repeat.