Good on you for going to see the principal. You shouldn't have to put up with rubbish like that from your son's teacher. Kids are so much at the mercy of their teachers when they are at school and I think some teachers take advantage of that.

I am a teacher and I am petrified of sending my kids to school because of some of the appalling things I have seen go on in classrooms. Some teachers are outright bullies.

Good luck with the principal tomorrow. I hope it goes well and your son finds his way to a classroom with a brilliant and supportive teacher. They do exist - there are lots of them