Honestly, the society that allows it. I'm really anti-fat and anti-obeast, so when I see these fat people acting like places like tumblr and facebook are their safe spaces to skinny shame, it's bad. It's even worse where there are encouraging signs in a doctor's office about how 'you are beautiful, no matter what the size!' These poor doctors having to deal with these delusional pieces of shits who think health and size have nothing to do with each other . If society put its foot down, people might not reach 300, 400, 500+lbs. I can't even imagine how to get to that size! If I eat more than 2,000 calories, I end up very ill.  People who think it's okay to balloon up that big don't deserve to be part of human society. People who think there's nothing wrong with that behavior are worse though.