It's not quite made up out of thin air, Everett: Faora in the comics does pathologically hate all men. She's also a serial killer and has psionic powers, so the movie version of the character is quite a bit different (at least as far as we can tell; who knows what Faora was doing off-camera).
Okay, and what of it? I'm not familiar with the comics that the character appears in; if the critic on rogerebert.com was, that's just another piece of evidence that he was reviewing what he wanted to see rather than the film Zack Snyder made.
Faora in the film has exactly one character-driven line; she tells Superman that "his morality is an evolutionary weakness." She does NOT say, "also, I hate your dick and it makes me want to destroy humanity." Ergo, the critic made it up.