This is the very definition of "feels > reals."  Some aspect of reality feels bad and unfair to them, so they believe that it should change, not them--they don't feel they need to analyze it more deeply than their hurt feelings, and some of them quite honestly aren't capable. Of course, humans cross-culturally shame fat people because expressing disdain for unhealthy behaviors is good for the survival of our species.  Groups with either neutral or positive stances towards unhealthy behaviors invariably have less-fit members with higher morbidity and mortality, and are less likely to succeed.