Stupid

I am not sure why I only tell the "not very good" deeds for David...
But there it is:

I just wanted to let you know that the reason David is on yellow today is that, at PE, he was not talking nice to his teammates and he called them “idiots”. He lost 5 minutes of free time and I put him on yellow. He told the truth when I asked him about it and I explained that he can’t talk to people that way.

Thank you

This is the email that I've got from his teacher today...
So I asked him at home what had happened and he said:
We were playing a race in teams...so my team was very very slow...I wanted us to win so I shouted at them:
-Run faster, you idiots!!!!!