The behavior may not be what you'd call average for a boy of ten, but it's also not terribly worrisome. Generally by this age, children have developed more of a thick skin or resilience when it comes to handling momentary disappointments. My gess is that, over time, particularly over these next couple of years, he will be better able to handle discouragement without such a reaction. He does recover well, and this is important. Overall I'd just let it pass - you really don't need to intervene.