Not to pile on Fly, but you've already gotten your "revenge." You've already proved him wrong time and time again. Let it go. Do your thing. Focus forward. You will be a much better man for it. Much better. And you being the better man, makes the coach the smaller man. Look wanting to prove a coach who underestimated you wrong is a very good thing. But as you yourself implied, it's best to just let your game speak for itself. And not just your outward game, but your inward game. It's by exercising inward control and self-discipline that you will really prove him wrong, not by getting down there in the mud with him.
Let it go. Focus forward.