Give them a crayon and a coloring book. Put them in their safe space, and close the door. This is political correctness at its best.

Just because you haven't witnessed it personally doesn't mean that it doesn't exist. Yes, there is a Fat Acceptance movement and no, it is not the same as body positivity. Fat Acceptance has been around for quite awhile and is supposed to be about combating anti-fat bias. However, most of the people within it use it as a way to convince themselves that they're fine, it's everyone else with the problem. They don't see being morbidly obese as a health problem and rage if a doctor tells them that dropping some weight may help their joint pain, hypertension, PCOS and may reduce their risk of several different types of cancer and heart disease. They believe that if a retail outlet doesn't carry their size, it's discrimination and that what they eat and the amount are in no way connected to their weight. These people are in no way body positime. Body positivity is about celebrating and believing in personal health regardless of size. These people denigrate anyone smaller than them, including other obese or overweight people that aren't their size. If anyone decides to eat healthier or ends up losing weight due to changes they've made to feel better (because many people in the BP movement do that), they are labeled as traitors or told they are fat shaming/fat hating. If anyone talk about weight loss around them, they are told they are fat shaming, like OP's story, even if they weren't involved in the conversation at all. These people are in no way positive. They're self hating underneath and project it outwards. They actually promote harmful behaviors because it is more important to continue deluding themselves that they're just as healthy as anyone else no matter how big they are, and some are quite large.