Why is it ok to skinny shame but wrong to fat shame?

People used to always tell me your so skinny, too boney, you need to eat more etc. Then why is saying your too fat and you need to eat less offence. Lots of skinny people are hard weight gainers they eat more but stay thin. Most fat people just lack a healthy diet and exercise.
Why is it ok to skinny shame but wrong to fat shame?
Why is it ok to skinny shame but wrong to fat shame?
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