i understand his reaction
Its hard not to be upset when the only thought that occupies Kai's mind is winning; also consider that he has had this mentality for years now. Winning in bodybuilding is his life and probably always has been since he started.
How hard he trained, the mental preparation, the dieting, the expectations, the time it took. It took a heavy toll on him but as Wiggs said when you are put in Kai's position you have a responsibility to the fans to maintain your sportsmanship.