There are LOTS of drivers who spend their lives driving around ignoring the direction in which they are headed -- instead watching their rear view mirrors, waiting for someone to do something they don't like. It doesn't take them long to find someone who aggravates them, so they pull over and try to start trouble.
I've tried reasoning with these bozos, to no avail. They enjoy confrontation, even when they're wrong about rules of the road... whatever.
Ignoring them makes them absolutely crazy. So that's what I do.