Not OP, but I'm from the Midwest, and around here guys has always (and seemingly will always) mean a non gender specific group of people. It's a shame that folks see it as a micro aggression these days, as we really aren't being offensive with it. It's just really, really hard to change the behavior when most of the Midwest (women included) are still perfectly fine referring to groups of people as guys.

I work with many women, but I don't manage any