It's because you live in a wealthy, developed country. In former Communist countries fat people were considered beautiful because body weight was connected with wealth. There's a saying here that you're wealthy if you can afford meat 5 times a week. So the Lizzo story is Americans imposing their own standards and related problems on cultures and people that have nothing to do with them. But trying to get away from Hollywood pushing their export to places where no one wants it a rule, not an exception.