Why do some people bodyshame normal-weight women and call them fat?

Just for not meeting their standards or being skinny?
If you don't like someone's body and looks, no one forced you to date them, but you can keep your opinion to yourself. 🙃

I'm a size M/ UK10, 132 pounds (5'6 height), have a normal body fat percentage, have a 0.7 waist-hip ratio, which is an indicator of health. Just because I don't look like a model, or am not an XS, doesn't make me fat.
Why do some people bodyshame normal-weight women and call them fat?
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