Right now I'm reading Temple Grandin's 'Animal's make us Human' and she is talking about how teaching the family dog 'frustration tolerance' - slowly and gently, makes for a happier dog and a happier family.
I would encourage you to praise very warmly every bit of flexibilty your son shows, or even if he handles his strong feeling of frustration and anger well.
I do know some teachers who are wonderfully confident and calm in the face of 'corrections' - I just figured that if this particular was one of those, your son would know that by now and it wouldn't be an issue.
Love and More Love,
Grinity
