Unless you are a prize fighter there is really zero excuse to get in fist fights in your 30's or 40's. I was at a poker lounge and a guy who kept losing tried to throw a sucker punch at me after telling me to step outside. All he did was give me ammunition to make fun of him for the next hour until the floor eventually got security to remove him.
A parent or a coach probably rooted a bit too hard for their kid or started trash talking a rival. Someone told them to cool it or to shut up and it escalated from there. Sadly, I have seen it before because some people need to crow loudly about how great their 8 year old future NFL superstar just whooped everyone good and the other kids should just quit and go home.
Meanwhile at the u20 championship a sprinter mocks another runner at the end of a race and is held in high esteem by the track world