First, I think the situation was handled near-perfectly.
Also, a friend of mine had a similar situation whereupon he stopped at a red light and the car behind him practically stood on it's nose. As he looked into the rear-view he saw the guy behind him get out and approach with vigor. He pounded on the window yelling "You coulda made that light" and then started pounding on the hood yelling the same thing. My buddy sat in awe as the man simply lost it, fell on his back and started foaming at the mouth. He looked back at the man's car and his wife and kid were in the car, the wife shaking her head seeminly not caring her baby daddy was lying in the street turning purple. Sometimes, road rage takes care of itself, but of course you can't count on that.