Why people laugh at others body/face?

My boyfriend is being humilated Again by our boss... now this bitch laughs behind his back saying he looks like a galgo dog

He is tall and skinny

And i said :"you are the sexiest and hottest galgo i know... know whats my favourite dog breed? galgo!"

I try to cheer him up, i say she is sick in the head, jealous, miserbale , sad

I can't explain or understand why a 55 y. o. millionaire would mock and laugh at him

Psychological explanation anyone?

Why people laugh at others body/face?
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