Meh. This is the kind of absurd handwashing that is more about making someone feel better about themselves than actually improving the general situation. The term "you guys" will be heard frequently in pretty much any work environment in the U.S.
I won't pretend to have all the answers, but I can assure you that women aren't avoiding tech because someone said "you guys". Spending 20 minutes with a bunch of cheerleaders should convince you of that.