Others have already made good statements here. I'd just like to add that there's no way you can "know for a fact" that someone is mad---someone you are completely unacquainted with. Also, while I am sure that the parents and teachers at Clarkrange High School try their best to teach their young people to behave properly and speak appropriately, kids don't always do what we teach them. It's entirely possible that someone in the crowd was saying ugly things that the guys on the bench could hear. Before we jump to judgement, we should remember that our own actions could be misinterpreted by those who don't have all the facts. Jesus himself tells us not to judge others, as we ourselves would not want to be judged.
We in Chattanooga apologize for any hurt or unpleasantness from Monday night. You shouldn't condemn a whole school on the basis of the actions of a few. I'm sure you don't want your own school's reputation to be based on one or two bad examples.