Sending out **Feel better** vibes to you.
I'm going through the same thing with my old boss. She's been saying some rather nasty things about me getting the old gossip mill working. It's a small town but I guess I'm lucky in that not many believe her. I left due to the fact that it was getting harder and harder keeping customers happy, (including my regulars), with their orders. I was being lied to by the person with the responsibility of ordering. He wasn't ordering anything he said he was and not getting reprimanded as he was the boss' fiancee. And I got in trouble for ordering things for customers that asked for specific items as well as copping all the abuse from unhappy customers.
So in the end I left. I didn't give her any notice when I did leave. I didn't have to and in the same week she cancelled two out of my four shifts without telling me the reason as to why. It even left the owners of the shop mystified but they stood back and did nothing. That was the last straw. I tied up all my loose ends and gave my notice. I know the owners had to come in, (they live out of town), a lot earlier than planned to help with things and to see what was going on. Though I doubt little was done about it. I know that there are unhappy customers out there because they stop me during when I'm grocery shopping and ask whether I'm on holiday. They're shocked to learn that I quit and worry about how they'll get their items that they need so I point out what used to be the opposition.
But people have been surprisingly nice to me. They've shown support even though I never expected it.
Try not to let it get to you. Be the bigger person and let your boss act the way he does. I'm sure everyone on your other board supports you as he is being banned. The truth always comes out.