It sounds like B.J. was more angry at himself than at Shaun Wilkie.
Non-ranking tournaments such as this should be fun. Nobody wants to lose. I remember years ago when one player lost a match and took his head and banged it on the corner of the table hard, so hard it drew blood, because he was so disappointed. Some people take it more seriously than others, I guess.
The comment by the commentator about the testosterone is probably on point. There are some rivalries and feuds that exist. I'm out of the loop on which players have a beef with the other, but I know a couple players who are not on my birthday cake list because of the way they act when in competition.
As an aside, I remember years ago that B.J. would drive to various homes and pick up players who didn't have a car and take them to the pool tournaments so they could shoot in it and have some fun. He was working a full-time job at the time and played in pool tournaments almost every weekend on the East Coast, wherever there was one.