Just reading this thread now but it looks as if your mind has already been made up.

IMO, it seems if the teacher was never going to accept him then you are better off spending your time doing something else. Very frustrating. IMO, some battles are worth fighting but from what you have posted--this one just not seem worth the effort. Your son can get a much better experience on the same curriculum at home with you. It might be different if this was something so unique and specialized that you needed the information from the teacher.

Crisc