I'm so sorry Granite.
My thoughts are that maybe your T was not mocking. I'm not doubting that you heard it that way, but just doubting that was what T intended. She has been so caring in the past, from all you have said. I don't think she would mock you.
I think probably, from things you have said, that your T sometimes feels very angry with the mother, because she has been so cruel in the past and still even now is trying to manipulate you. It's painful to hear about someone treating another person so badly the way the mother treated and treats you. So maybe T is speaking with a lot of emotion about the mother. I think that can make things hard. My T gets upset about some of the things I tell him, but he explains he is not upset with me, but with other people because of how they were with me.
I agree with the others that it would be good to try to explain how you feel.