Mate, you gotta think outside the square.
Witman is a proto-Nazi. (I don’t actually know what proto means, but it’s good to throw it into a conversation to make me look erudite. I usually follow it up with other empty but important sounding phrases like “paradigm shift”, “beta analysis”, “skill set”, “let’s unpack that”, “drill down”, “data mining”, “let’s get traction for take off”, “are you inside or outside the tent?”, and “have you seen the fabulous tits on that new blonde sheila with the stunning arse in Personnel?”. I just throw the last one in to see if the blokes or, worse, the feminists in the room are awake.)
Don’t ban him. That’s what he wants.
Get him engaged.
Tell him that if he doesn’t post at least once a day for the next forty years, you’ll have Mossad come round to his crib (this is a cool term for one’s abode) and attach alligator clips to his scrotum (this is a medical term for a nut sack, which is defined appositely in the alternative as “2. a stupid ****er who does or says dumb shit and will not stop” http://www.urbandictionary.com/define.php?term=nutsack ) and apply as much voltage as it takes and for as long as it takes for the current to travel up his genito-urinary tract with sufficient force to circumcise him by the “scorched foreskin removal” method, which will leave him with a burnt knob and looking like a Jew if there is a pants-down pogrom in his area.