I understand your situation, I really do. There's a point in the particular cocktail of mental health problems where you even think you're objectively viewing your behavior and you're not, and you literally do not understand why you get the kinds of responses from others that you do. It's been happening to me for literally decades.
Then I stopped choosing to be frustrated, and started asking myself why this was happening. I went (and still go to therapy), I do my best to recognize bad patterns, and I know that I will fuck up without meaning to, and understand that I need to acknowledge it when it happens, make amends, and forgive myself when it does. I'm still working on it, I'll always be working on it.
And it's not all universal. In the past year I got page-banned by someone completely out of the blue, without any reason given - and when I tried to figure it out on my own, I wasn't correct, though I still took responsibility for a choice I realized was wrong, and as someone with anxiety, having people freeze you out without knowing why is the worst thing. Funnily enough, the issue was less about me and more about them in the end - I had triggered them in a way I literally had no idea about. But the situation left a bad taste and I couldn't continue on the game because of it.
That said? If staff did their due diligence, they at least took the time to tell you why they made the decision to ban you. They may even have tried to correct your actions prior to banning you and giving you some form of heads up/warning to course correct. And yeah, some staff are just assholes, but that is not often the case, especially now in the later years of mushing for most of us.
The best advice I can give you is to bear in mind that while mushing can be helpful, it doesn't replace therapy or psychiatric care. If you are behaving in a manner that leaves you feeling less in control (and negative experiences can certainly make that spiral hard), best to step away for a while, and talk to someone, preferably an expert, about why things occur for you the way they do. Take responsibility for your choices, acknowledge what leads you down such a path, and make the effort to improve.