many people believe that a licence proves they can drive, very few people these days see road craft as a skill which can always be improved and worked on. As such when you confront any motorist the majority will see you as the agressor and a critical one at that.
When confronting someone you must ask what you wish to achieve, and the fact the desire to do so usually comes after a near miss often means the discussion does not start politely but rather with tension which increases.
I personally take a deep breath, count my blessings that I will get to see my family again that day, I remind myself this tightly wound idiot who does no exercise will likely have high blood pressure and a heart attack at some point. I then do my very best to keep the hell out of the way of the poor driver.
Road Rage, Agression and Road Accidents have horrible statistics.... don't let yourself be one, it's better to swallow pride than blood imho