I'll never forget what one of my training partners said to a guy who picked a fight with him.
The guy threw a sloppy punch, my friend (a Judoka, primarily) threw him to the ground and held him down. He said "People like you pick fights for fun. Today, you picked the wrong guy. Fortunately, I'm the RIGHT wrong guy. One day you're gonna pick the WRONG wrong guy. And he's gonna kill you." He then stood up and we walked away.
Lots of stupid people out there.
Train hard or don't bother.