He probably thought you to be a multi id poster, which seems to be an obsession of his. He pm'd me a couple of times, nothing unpleasant, but he did bang on about multi ID's in a slightly paranoid way. I have no idea why he's so bothered by it, every forum has its contingent of people posting under different names.
And fwiw, my guess is that he'll be back after his ban in one guise or another. Its a lengthy ban but I'm sure roopsy said it was still a temporary one.