I was in a similar situation many, many years ago (no such thing as a cell phone). I got ahead of the jerk in the car, stopped and waited for the dickhead. He pulled over and screamed obscenities and would not get out of his car. When I approached him he took off. A guy in a truck said he saw the whole thing and offered to be a witness if I wanted to call the cops. I declined and went the other way, never saw the jerk again.

I do not get into arguments with cage drivers when I am on a motorcycle, it is an argument I can't win.