How did the party go last weekend? I hope you survived!
I think that places within toxic families become firmly 'fixed' and when you, the child, tries to change your role other members do their best to resist. You're challengin, and changing, the status quo and they don't like it. You saying they still bully and belittle you when you try to bring up the past - you're forcing them to view things from a different angle and they don't like it, so they react.
I get this in my family, where I'm seen as the 'rock', the one who doesn't have emotions. This goes back to when I was a young child, deciding I couldn't cry the day after my father died as I felt someone had to keep control. The few times I've broken down in front of my mother in the years since she's belittled or dismissed my feelings, and the summer I spent trying to avoid a pervert she deliberately put me in a situation where I was alone with him, despite my having asked her to stay.
My sister, on the other hand, is allowed to have emotions, and expresses them freely. My mother complains about this to me, as she is scared of upsetting her, but still, she acknowledges her feelings.
The strange thing is that my mother things she's closer to me yet I tell her nothing unless I have to. Why would I? So she thinks I lead a charmed life where nothing goes wrong. I'd love to be able to turn to her for support yet I know I won't get any so don't. Of course she then gets upset I don't tell her about my life, but it's a protection thing.
I really hope you're ok and got through the weekend. I survive by being low contact with the pair of them, and laughing at the predictability of it all when they keep to their script. They still hurt me, but not so much.