I think the issue of "dude" and "guys" is getting blown out of proportion. A lot of other girls (GGs) I know say dude, or use the general term "guys" when referring to a group of mixed-gender people. I don't see what the problem is. Instead of someone saying, "Hey guys!" when referring to a large group, would you rather they say something like, "Hey miss, sir, sir, miss, miss, sir!" or "Hey people!"?
"Dude" and "Guys" are pretty much slang at this point, and have been for a while. They are general terms people use, and do not necessarily have the same original meaning. I don't think anyone is thinking, "Oh my! My gender identity is so insignificant! I guess I should start using male-specific pronouns to further denounce my gender identity!" Do you really think GGs think that much about their gender identity?
~Sarah