My mom complained about how “fat” she was and related that to so many insecure moments in her life when I was a teenager. It made me afraid that the same thing would happen to me and I would be just as unhappy if I ended up in her shoes in that way.
So when one day she mentioned my butt looked bigger, it really stuck with me, tipped me over the edge so to speak.
I still get scared of those kinds of observations now.