I've said it before, I'll say it again. Obesity is not a disease. Being fat doesn't make you a special interest group, and it doesn't make you "average." It makes you, well, fat.
Rather than agree that yes, fat people should lose weight, he/she becomes affronted at the very suggestion that fat people should exercise. I suppose you want two airline seats for the price of one?
Well whatever. Your heart attack, not mine.