There seems to be a propensity these days of young people fighting.
Whenever there is a large crowd of teenagers, a fight is not far off.
The best advice for a foreigner, is even if you think you are trying to help, do not get involved!
Do not get involved in ANY fights period!
While it may be hard to watch someone getting beat up, it will be even harder when both Thai sides gang up to beat you up.
This is a no win situation.
These youth have no fear of going to prison and cannot even rationalize that.
There is no reasoning or common sense.
The best advise is to just leave and don’t look back.