He has a type of personality disorder and you won't change his mind. I'll bet he doesn't believe most of history because he didn't personally experience it. A complaint by you and your parents is in order and get into another class.
OOps sorry, you are the parent. Get you child out of that class and file a complaint.
This guy is apparently an ex-hippie type who grew up to get a soft degree in education. His choice of becoming a history teacher is another easy professional route. Many history teachers have created their own revisionist versions of the subject. We must not confuse this one with facts.