This is going to be really really tricky, because the chain of command that is set up is that the parent should go to the teacher first and ask what their side of this story is. That is great if you can do it, but when you are considering if the teacher possibly is a bully, you may not stay calm enough to have a good meeting.
So I would probably suggest going to the principal and explain that your child is considering refusing going to school, explain his side of the story and how it made him feel, and you are not sure how to approach the teacher and you need his or her help with this situation.
After you get more information about it, you can then decide what else to pursue.
I really hope it goes well!
