I never like to see that kind of attitude anywhere, let alone on the golf course, but in Chris Doleman's defense, a career of concussions and mini-concussions will make any man's temper a lot shorter (CTE). As a teammate of his, I think one has to understand that this is a possibility with any of these guys besides Del Greco, and you have to adjust, take the abuse, and not make the situation worse by firing back at the guy.
As a defensive lineman, this guy was in the trenches for over two decades including college and high school, and he sustained God knows how many blows to the head over that time. If I'm Brian, I just take it and do my best to respond with a good shot for my team. There's no sense in judging the guy in either the short or long term given what I know about what football can do to even the nicest of guys.
I'm not saying that this was 100% what was happening when Doleman acted like an ass, but the probability of that being the case is simply too high for me to react in a way that I might with someone who I knew did not play football at one time in their life.
So I'm not necessarily excusing the guy, but saying that if I'm his teammate, I move on from situations like that real fast.