Why Koreans are hated by Japanese?

This is one answer for that question. In the video shown below, Koreans are in white, Japanese are in red uniforms. A Korean player throw away his tapings after the game.  The captain of the Japanese team go furious about that behavior and the Korean picked up the trash and handed to Korean captain. Now the Korean captain throw it away again onto the ground. For the soccer players, the ground is a sacred place.  No one can understand why Korean soccer players can do such insulting behavior. It is just beyond understanding.