I wouldn't wait until it happened to you to do this. YOu have to blow up about it, show how much are pissed, tell him he is out of line and to shut the hell up when he is not in the hand. I saw this happen to a guy who honestly did know what he was doing was out of line (he just liked impressing people with his knowledge). He didn't like being made an ass of and called out on his action or the uneasy atmosphere that was created and shut up for that night. Plus I think others would back you.