Thin people don’t fat shame because they are genuinely concerned with a person’s health. To them, body shaming is a way of asserting dominance over a fat person. It’s them saying, “yea, you’re smarter and more accomplished than me but it doesn’t matter because you’re still *fat*.” Thin people don’t want to lose this power. They want to be able to destroy a person completely by calling them fat. They want to uphold their privilege in society and that’s why body positivity bothers them.