He doesn't appear to handle either competition or adversity very well, but I'd say it's more anger than whining. He reminds me of men that sit around and yell at the TV during sporting events. To me, I guess, that's not whining, but it is some other negative emotion release. I hope that the psychologist will continue to work with him on identifying and getting it out in other ways - maybe he'll continue the boxing sessions.
As for everyone else, I'm liking this group, so far.