The profanity on the field and from the stands (at certain stadiums) is pretty bad from what I've seen, it's taunting plan and simple and shouldn't be tolerated. I've heard it goes on in alot of games and could easily be policed by the referees and coaches if they really wanted to put an end to it. The only thing turning a deaf ear to the problem does is allow incidents described earlier in the thread to happen and eventually someone is going to get hurt, if it hasn't already happened.