When I was a teenager my father sat me down and told me the following:
NEVER, EVER get into it with someone you don't know, it's just not worth it.
They could be:
A. A Karate expert, who could really put the hurt on you in seconds
B. A coke or meth head, enjoying a 10 day binge
C. A Violent person with no regards to common civility or common sense.
D. A gun nut just looking for a excuse to " pop a cap in someone".
E. Just a bad case of PMS
F. etc. etc. etc.
This advice has served me well.