In Japanese media, an unusually high percentage of Chinese people will know a martial art, from the harsh, half-senile Old Master, to the petite young woman. It will always be a form of Kung Fu, never a Japanese style. Just as the Badass Spaniard isn't necessarily from Spain, in some works all Chinese people may know Kung-Fu because they belong to a fictional version of Chinese culture based on this stereotype. Regardless, it's not unusual for this trope to involve some sort of Chinese rival or Chinese rival team. If you're lucky, this will lead to a scene where Everybody Was Kung-Fu Fighting.