[sejje]

GP: > "Guy" and "dude" are definitely gender-nonspecific

You: > find any native English speaker to whom "guy" primarily denotes a woman.

It's not supposed to primarily denote a woman, GP specifically said it's non-specific.

That said, I disagree. I think guy is gender specific, typically. I also have very, very seldom heard a woman called "dude." Certainly the non-specificity isn't universal.