Why is it ok to call a man short, but not ok to call a woman fat?

StrategicThinker
So any man who is below the average height, its ok for women to call them short, but any women above the average body weight, men should be nice and never call them fat?

I ask this question because a few days ago I overheard a woman calling a man short because he was short. Now I could only imagine if that same man heard her and called her fat. And yes she was fat.

Note: And before anyone come with insults towards me, I'm 6ft 3inch tall with a very lean body. Eating right and hitting the weights and cardio 5 days a week does wonders for the body.
Why is it ok to call a man short, but not ok to call a woman fat?
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