Is telling a girl she has a fat ass disrespectful?

How is that disrespectful when the girl posts pictures of her bare ass
literally.
She covers her private parts but she literally posts pictures of her bare ass.

How in the world is that disrespectful?
It’s disrespectful
It’s not disrespectful
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She took screenshots of me apologizing and put them on her page
Is telling a girl she has a fat ass disrespectful?
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