hard against what is appropriate and inappropriate behavior. Tackling or blocking someone out on the street will get you thrown in jail for assault. Emotions and competition push right up to the line of violence, and that is why there are so many referees out of the field.
The purpose of sport is to simulate ritual combat. It is a useful thing to teach cooperation, competition, strategic thinking, etc. It is also a good way of learning how to manage one's emotions. That is one way to describe sportsmanship. "Humiliation" is best done by acknowledging the score on the board. Once the final whistle is blown, then we should return from the game to normal humanity. Anything more is inappropriate.
It shows very poorly on the athlete and the organization to go beyond.