Thanks. Sorry I didn't read the last day or so's posts so have splatted out my stuff in the middle of a heated debate 
I think I'm finding it so awful because as a child I was trapped in a situation where my mothers cruelty, paranoia and warped reality was imposed on me and I couldn't get away, we were completely isolated, so I used to try and fight back, try to change it. Trying to engage again and again and again and getting hurt each time. I'd try and explain myself, protect myself and generally answer back. The saddest thing looking back was my defense of my dad, a child fighting to protect my father against the cruelty and viciousness of my mother (when, he should have been protecting me and my darling sister). That was my life and it was a living hell. Then as a young adult I learnt to disengage. The most powerful protection and care for me, the first way I found to get away enough to start the long road to recovery (which I'm still plodding along on!).
Getting away was safety, it was kindness and it was a massive gamble that maybe I was worth looking after like other people seem to believe they were. It was a life saving change in behavior for me.
Oh and no, my mother would say she has no idea why contact is as low as I can get it of course! I'm 'hard' and hurtful and uncaring etc. But for me, it was about survival, not destruction. Funny that my first act of love for myself was seen as an act of hatred.
I don't mean just getting away from the house, and the village and everything and everyone I ever knew ... it was the harder bit of disengaging from her reality, her power, her everything. Withdrawing from the badness, like you pull your hand away from a fire, and I had to learn that reflex. Taken me years and years to learn it.
And learning how to break all those little hidden skeins of sticky web that mean my life still circles/d hers - either defining myself by her or against her iyswim.
So it's not only awful to engage with, well, a bully would be the politest way of putting it; I'm forcing myself to go against such a strong instinct to protect myself by withdrawing, disengaging, don't play the game, don't engage in battle, letting them win as I smile warmly whilst I back out of the door.
I've learnt how to leave things unfinished, leave things unsaid, leave your image tarnished or let falsehoods stand because if you engage, you get hurt, and I need to not let myself get hurting.
I feel like I just deliberately put myself in harms way, I let someone abuse me. Sat there and let her get in my head and crawl all over me. Engaging when I KNOW you don't win against that type of person. You never win. But I have to stand up for myself, I can't let her do what she's doing. Not good. Not good at all.
But at least I recognize what she was doing, and what she is, thanks to this thread and the rest.