He almost always only tells people to shut-up when they are ranting on and on.(if you have watched numerous shows he himself never rants and stays very calm) He is definitly one of the best debaters around. When the other party he is debating starts to become agressive, insulting...ect he will tell them to shut up, in some cases tell the sound guys to cut their mics. I saw a few of the ones where he told them to cut the mic, he was definitly right to say it.