Berbati should be perma banned as he is definitely a wind up merchant.
Berbati does like the odd wind up, but none of us are obliged to take the bait.
Berbati also knows a lot about his favourite player, and it is possible to have intelligent discussions with him.
So, rather than perma banning him, it's surely easier to ignore his obvious wind ups, and engage with him when he has something worthwhile to say.