Well hey like I said. The guy is responsible for what happens to him.
See there? I think the jock was incredibly incredibly rude for doing that. If that is what most people think "challenging" is then I'd say the MA community does NOT need that. Very childish.
As far as the instructor's attitude, well he ignored him at first, and took him out when the guy wouldn't let up. Shouting like that probably scared the guy off a bit too.
No one really wants to fight someone crazy..
Ryu