I can empathize. I've had that several times in the past. Some are open to discussion about your experience, but I found that many are completely closed off to any feedback. Ironically, it seems that the ones who need the feedback the most are the most defensive when they get it. I think that it has to do with egos and insecurity when people act that way. Perhaps being reassuring that it is a team effort and that his success is everyone's success. Demonstrate support without pinging that insecurity. I know it's a fine line. If I can't resolve a situation like that with diplomacy, I do tend to get passive-aggressive as a second step.

Good luck!