The progressives discussing this are clearly wrong. The teacher is making a point about how ridiculous and useless saying it is, and it's clearly HIS problem. He didn't stress how it can be hijacked by kids to intentionally be disruptive, he said how ridiculous the usage is in the first place. Clearly a little tin pot dictator that's letting his personal business cause issues in the class. And of course, far more disruptive in the long run - he had to battle parents over the issue already, he's going to have more issues as the story is in the media now, and his little bout of authoritarianism is going to likely start influencing the school itself. Hell, look at the case of Bananan Man - the kid that ran across the field during halftime at a football game and was suspended. It became such a shit storm that the principle of the school was forced to resign.