There is actually an evolutionary cause to that all. As a social species, humans had to find a way to understand the difference between individual desires and the needs of the group to function. Therefore during the evolution of our species, we established functions to ensure that a collective could work together despite the differences between individuals.  Children mimic the behaviors of other children in groups, because it is rewarded with being included better in the social structure. Adults do the same, albeit a bit more refined. The reasons behind certain aspects of hierarchies like sucking it up to the boss are partly found in the social nature of our species. Engaging in behavior conceptually going against the structure of a social group, like killing members of the tribe, withholding resources from the group for personal gain or engaging in behavior the group deems detrimental all cause the same feeling in sane, healthy humans: shame, guilt and remorse. So being a disgusting eatbeast should and does cause this natural response. Weirdly enough, we are currently engaging in an experiment how far we can drift away from our biological social cues that made us functional as a species in the first place. Single humans are not very capable regarding survival. They lack mechanical tools like claws, efficient teeth or great physical abilities, our specializing ability means a blacksmith could forge great weapons if only he knew how to mine and refine iron, and so on. We only excel as group. That’s the reason behind the other thing that makes humans feel bad: being alone. So that’s the explanation why fats are disgusting fucks. They constantly feel the shame we are engrained to feel for their behavior, and they are alone since everyone sees them for their gluttonous anti-social self. And no amount of left-wing whining will ever change this biological truth, so fats will forever stay miserable and insufferable. And the biggest irony is that the FA movement brainwashes them to think that they should not feel ashamed and disgusted by their behavior - a very cue that will never go away - so they even force them to ignore the cues engrained in our brain to guide us out of misery and back into our social group. That‘s for me the main reason this movement is so toxic - it actively seeks to keep its followers in the maximum state of misery possible.