D.S.
You are not overreacting in fact if someone spit in my face I would probably have done the same thing. That being said I think you are doing all of the right things. Is it possible for your son to be present when talking with the teacher so maybe he will confident to express himself to her with you there. At that time maybe he and the teacher can come up with a plan if someone is bothering him how he should handle it. This is such a tough time for a child to realize the difference between tattling and speaking up. I always taught my children if they felt threatened or that someone is going to harm them then it was okay to ask for help. If they saw someone hurting someone else they should speak up, but if it was something that wasn't their business, and it wasn't going to hurt anyone then the teacher would handle it. When you meet with the teacher I think you will get a better perspective on how she is going to move ahead. He will get it he has to find his own way. Good luck!!