A quote from the ops manual at my previous employer. "The sort of person who is frequently involved in disputes isn't suited to flying."
Years ago as a new F/O undergoing line training, I had a safety pilot on the jump seat who was reading a book on anger management. This guy had previously sworn at an air traffic controller who made him read back a clearance. This was at a joint use facility with military controllers and it didn't go down very well. He had to be flown back there at a later date and had to present himself in the commander's office and apologise to the controller involved.