I feel so ashamed and angry.

I've had the most stressful work day, with part one of the culmination of an extended pre-restructure process.
At the best of times I find it hugely triggering when people put their hands on the headrest of the seat in front on the bus. It feels a violation of my personal space, as well as sending me into dissociative flashbacks of the bullying at school - which included having things thumped on my back and thrown at my head.
Today I turned round and asked this man if he could please move his hand from there.
He did, but then he moved seat.
A woman passenger objected to what I'd asked, and called me rude and racist. I, to my humiliation, explained why I'd asked him to move his hand. Not for him to move, just his hand. She shouted at me, and to my shame, I shouted back. Even when I explained, she persisted in calling me rude and racist. Even when I said that racism has nothing to do with it - and it's true, anyone who invades my personal space like that makes me feel unsafe. I was bullied at school by a gang of white girls my age, for heaven's sake! And I'm not racist. I just have had a difficult day [understatement] and feel vulnerable.

Maybe I should have just got off the bus when he put his hand there, without saying anything. But it was dark and I'm exhausted.
I literally cannot tolerate anyone's hand that close to me.

Maybe my request was a bit inconsiderate, but I did ask calmly and quietly. Maybe it had an undertone of rudeness, but that's the way unfortunately things come out when I feel unsafe.
I didn't make a scene until this woman made a scene and publically humiliated me and accused me of racism. She was making it into something it wasn't and just used it to pursue her agenda.

From what I can gather, one woman did speak up for me, but I didn't hear what she said. But she was jeered at by the other woman when she left the bus.

I feel so ashamed. What if I see these people again, or if they see me? What if she told the police?

I'm not a horrible person, really I'm not. I struggle sometimes to live around other people, with the legacy of my past.

What would you do in a situation like this? Do you think I'm bad?