Why fat women seem to be bitter and mean?

I’m gay and I am friends with two women. One is overweight and unattractive, and the other one is beautiful. While these two are “good” friends, the fat one always tries to compete and badmouth the attractive friend to me. I don’t want to be two faces so I never tell my other friend about that whale. She is so mad that she doesn’t get the same amount of attention and she always questions why guys don’t ask her out instead. I am so confused here. Like do fat women live in delusional thinking they are attractive?
Why fat women seem to be bitter and mean?
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