Does an X Supervisor have the right to talk about you to all her employees via text just to vent

My X Supervisor had all her employees on a text so she could message us all at the same time. I had already left there I QUIT. She did not take me off the texting system. SHE SAID via text, OH CAROLINE CALLED AGAIN UUUHHHH. I replied that is good because you told me to contact you if I had any questions. She went on to say that I was abusing calling her, I call too many times when in reality I only called once before, Stop calling employees she said. False statement again. You really do not want to leave here. With each statement I said, I do not belong on this staff texting system and to please take me off. She only took me off when I finally said, I WAS NOT FIRED I QUIT. WHY WOULD I WANT TO GO IN THERE AGAIN? Do I have a case. She deliberately attempted to humiliate me on this texting system when there was no reason to bring up my name in the first place other than to embarrass me. Prior to that I told her I was picking up anger. She denied being angry and then called and started screaming at me.