There's really no point in engaging in any convo with this... Evil spirit. Imagine someone possessed by an evil spirit and an exorcism is needed. You wouldn't try to reason with, be nice to, or have sympathy for the evil spirit. You'd just want to get rid of it.

Best thing to do is to identify and ignore. Look for the B word that he loves to use but is hardly used by anyone else on the forum. That's the best way to identify his next account.