Why do people keep hating on normal female bodyweight?

It would be too easy to blame it all on Hollywood, though they're especially guilty of it.
But I can't help but notice people in general have got really fucked up ideas about what is normal size for adult women. And the vast majority of blokes around here seem to routinely express attraction to women who look grotesquely underweight to me. Meanwhile if they see an ordinary woman of ordinary size like you'd find anywhere in the street, they call her "fat".
What kind of mental issue leads to this screwed up perception?
Is it just because all the actresses in TV and films are basically anorexic on account of unrealistic standards perpetuated within the industry... and that is somehow being presented as normal to the viewers?

Why do people keep hating on normal female bodyweight?
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