Selfish mum

How does everyone deal with a selfish mother? I’m so pissed off and angry with her!! She doesn’t respond to anything, she’s childish, she will just ignore me and not speak until I give in and text her. She thinks being a good mother is buying clothes and things for her grandson. We only moved back to the area where she lives because she said she would help out. She’s done nothing to help, she puts her drunk husband first and then my uncle is more important as well. Me and my son always come last. And even when she does come over , I get told my house is dirty, I get called fat, she says things about my partner as she doesn’t like him. It’s constantly negativity from her. I’m mentally drained by it all. I’m autistic it’s too much for me. I wish I had a normal mum that actually cared for me and was bothered about seeing her grandson, and didn’t put me down all the time.