I am boggled by people's inconsistent application of the arbitrary rule that to like and cheer for an athlete, they need to like them as a person. I enjoy watching Tiger golf; as a golfer myself, I can appreciate how great he is at it. What he's like personally, I really don't care. Obviously he has destroyed his marriage, no doubt, and that's sad but doesn't make me want to watch him play any less.
Many great athletes, artists, writers, you name it have been philanderers, crooks, egomaniacs, etc etc and yet people love and glorify them.
Re: emotions on the course, he said he would try to control and limit them, he never said he would show zero emotion. As he said, it's Sunday at a major and he comes out playing like garbage for 6 holes and effectively kills any chance he had -- of course he's going to be upset.