This. ^ The woman is 90, she's not going to change, and ghosting her and calling a rancid old bag or something (as a few posters have suggested,) and threatening that she will never see you again is pointless. All you can do is ignore her comments. After over 50 years, you'd think someone would be used to it by now and just ignore it. She obviously can't help herself.
That said, you are entitled to feel annoyed, but saying she makes you feel worthless and shit isn't helping you. She's not going to stop, so just ignore the comments. I know it's hard but you can do little else really. My mum was very critical of me, and made really barbed comments, I mean about everything about me. My weight, my hair, my job, my husband (and any boyfriend I had before him,) the way I was raising my children, my house, the way I drove the car, all sorts. (She couldn't even drive, but still slagged off my driving!)
Weirdly though, like with you @GoldOP she never EVER critisized my brother. (He is 9 years younger than me.) He could do no wrong, he was the blue eyed boy, and he never had to lift a finger around the house, and was waited on hand and foot by her. I was assigned chores in the house, and was scolded regularly by female relatives and female neighbours for 'not helping my mum more' in the house. I shouldn't need to be told apparently. I should be just doing it.
Not my perfect, precious, golden-boy brother. Noooooo. He didn't have to do ANYthing!
He was regularly bankrolled too, by our parents (and grandmother at some points) he was out of work half the time, and he was a layabout. Bone idle. He got married at 33, and I honestly have great pity for his wife. I have very little to do with him now, and haven't for about a decade and a half since our parents died. Once they died (very close together,) we drifted. He lives 100s of miles away from me now, and I haven't seen him 7-8 years, and aren't bothered about seeing him. He has a son, who (from what I have heard) is as much of a useless grabby entitled twat as him.
But yes, historically, many mothers favour boys/sons, and it honestly fucks me right off.
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