I think the only lesson you should worry about your son learning is that he can only control his own behavior and emotions. There will always be people that disappoint us or don't make the decisions we'd make - whether on the field or at work. That's life.
I don't ever recall seeing my son show anger, disappointment or frustration with a teammate at any level. I would have been very disappointed if he had. As you said, we all have our strengths and our moments... teammate means just that.