I find it strange too. The only thing I can figure is that every woman I know in real life is secretly in love with me, and me referring to them all as part of a group, and in a gender-neutral tone, mars whatever wild romantic fantasies they're no doubt having about me.
I mean really, when you think about it it's the only explanation that makes any sense.
There might actually be something to that. Most of my friends IRL right now are guys, and they think of me as "one of the guys." It sort of sucks for prospective relationships, because they don't even see me as a heterosexual woman. A single, heterosexual woman. -_-
(not that I'd date any of them anyway, but it's the principle of the thing!)