Interesting thread.

I think it comes down to 2 things.

All women deal with sexism regardless of size.

Thin women deal with a lot of internalized sexism from other women in the form of "she must be a man-stealing b!tch."

Fat women deal with fatphobia and sexism. It's a complex combination where we are desexualized as women and usually made into cartoonish mama-figures. We are often invisible and have our womanhood, our personhood stripped from us. We are degraded as women and as fat people.

Fat or thin - women deal with a whole lotta nastiness in this world - and a lot of it we heap on each other.