Why do former fat people have such a disgust towards fat people?

Anonymous
My coworker looked at me in disgust this morning even though he knows I'm trying to lose weight and I've lost over 30lbs. He used to be over 300lbs and now is pretty fit and works out a lot.

It's not like I'm not trying to lose the weight. I'm practically working out every day and almost starving myself each and everyday by eating less than 1000 calories a day.

I want to prove to people like him that I can do it and be at a normal weight. It will be so satisfying to see the shocked look on his face the day he sees me small.
Why do former fat people have such a disgust towards fat people?
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