Are there any legal defenses for being blacklisted?

I have been a martial artist for over a decade; it have become not just a hobby, but a way of life for me. Two years ago, I be blacklisted by my sensei who not only banned me from their training facility, but from all the ones of my style within my state, & stripped me of my rank. The incident that caused this was a simple misunderstanding, and other practioners enjoy gotten away with much worse with little to no punishment at all (mainly because they are nearest and dearest members). In short, I was wondering if anyone out there has extensive know-how of the U.S. legal system to give me any information if this particular personage can ban me from public places that they do not own, but have influence in. Is here any way an instructor that has no qualms with me, but is following this dedicated persons' "orders" to bar me be able to train me if I present any legal claim that my rights are mortal violated? Any help is greatly appreciated.
He has every right to ban you! If you do not follow the rules you hold no right to be there. Instead of playing victim and threatening a lawsuit, how about man an adult and take responsibility for your own actions? Not solely will that make you a better person but it is probably exactly what the instructor is waiting for. It does not matter who did what since you, what matters is what YOU have done and take responsibility for it. You be wrong, period. To attempt to file a lawsuit will only preserve you banned from the sport that you love the most....and that is cutting bad your nose to spite your face.
I can not offer you legitimate advise, but this sounds like a defamation casing may be possible idk