Wow - that is really appalling! I wouldn't be surprised if you don't hear a thing from the school because the teacher is probably too embarrassed to admit that she stuffed up and 'lost it' at a student. Best of luck - hope your DS can forgive this teacher and move on from it. Big call for a 16 year old because it was a very demoralising statement to make to an adolescent whom she is supposed to be setting an example for.