You've gotten a lot of great advice above. My son also had a coach that told him he would never play high school ball - he was too short, too fat, not athletic enough, etc. He said these things to a 12 year old kid. My son made the varsity roster as a freshman. This same guy now says my kid has the body type that recruiters are looking for, he is very talented, etc. My son used this coach's words to motivate himself, but we never let him turn that motivation into a negative. It sounds like this has gotten away from you a little bit. I can definitely see how his treatment was very hurtful and you are still hurting from words and actions. As someone said above, the best revenge is playing your best and making him irrelevant. You've already proven him wrong. Time to stop giving him so much control over your future and make the most of your opportunities with positive motivation.
Good luck!