''The thing is that if someone is being shamed, stigmatized, bullied etc. for being fat, and we say “they aren’t fat” or “they aren’t even that fat”  in their defense, what we are also suggesting is that there is a size at which they would deserve that treatment, and that’s just not true''.

https://danceswithfat.wordpress.com/2015/12/05/amy-schumer-isnt-fat-and-other-things-that-dont-matter/