Fat shaming and discrimination are objectively bad. But they aren't a product of a society that has failed us. They're a product of our innate animal inclinations to favor the strongest and fittest. As long as we are a resource and food-rich society, nothing is going to change that.

Edit: On second thought, society has utterly failed us. We've curated a diet of processed foods full fats, sugars, and poisons that stack the cards against anyone who is not genetically or socioeconomically favored. They compare trying to stop obesity to getting rid of yellow teeth to rid yourself of lung cancer. Trying to get people to stop fat shaming while ignoring our diets is exactly that.