[TV]Fight between two badminton players

The commentator said they are really disappointed with the game? Which country's player versus which country? 
Why do they fight with each other after the game? Isn't it a fair game sports? Is there any spirits of sports game? Is winning and losing of the game that important in a sports? 
We might not really know what's happen behind the real scene. Anyway, a sports spirit is always that important and wining or losing of a game shouldn't be the main objective of the game.