Background (based on what I read in the comments):
The person who posted the video said that the tai chi user was an old man from his neighborhood who was known as a tai chi practitioner.
The incident involved the younger man’s scooter almost knocking into the old man, and instead of apologizing, he called the old man the equivalent of ‘stupid f*cker’, which led to the subsequent *** whooping.
This happened in Vietnam apparently.