this is idea is super boring. literally no body positive people are saying that skinny people are the devil. it's terrible that any body is policed for not being the ideal and no body represented in the media is realistic. but thin is what's held up as the standard of beauty for women. disparaging things said to skinny women is backlash on that basis,
the only thing that came close to being good is the bit at the end where they all pat themselves on the back for not being fat because even in body positive circles, "you're not fat you're beautiful" is seen as a complement when those 2 things aren't mutually exclusive.