Did anyone catch this:
"School officials allege Mason had displayed this kind of behavior for several months, despite numerous warnings."
In my opinion, based on this comment this is one time the school got it right. I agree with everyone that common sense has definitely gone out the window and if it was the first time he'd done something like this and was suspended I'd be outraged as well. It's ridiculous how it's going in schools these days.
However, if he had been warned numerous times (and I'm assuming that his parents were told), then this is the correct thing to do. Not so much because of what he did, but that he knew it was wrong and had been warned not to do it. It's a discipline problem.
I have a 6 year old as well. If they were doing something and had been warned and I had been informed, my 6 year old would understand not to do it again.