Why is it wrong to tell a girl she is fat if she is fat?

If a girl wants to know if she looks goo and she is fat, what is wrong with being honest? If she can't fit into normal sized clothing and can't do 4 push ups without getting winded, then I am sorry miss, but you are out of shape and fat, lose some weight.

You are not curvy, you are fat, deal with it or get into shape.
Why is it wrong to tell a girl she is fat if she is fat?
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