This is a good point.  They don't know the difference.  That's why they hate people who lose weight because those people do know how horrible it is to be fat and can explain how much better life is fit and it destroys their self-lie narrative of anything we can do they can do better.  She has no idea what it's like to move without pain, move without panting, fuck without accessories and pillows, bathe without having to roll in a vat of baby powder afterward to stave off the rashes, and on and on.  She has no idea how bad her life is because she has never felt really good.