In my opinion guys is gender neutral though! I was a waitress for a long time and I would think nothing of saying hi guys to a group of girls?! Its not like you are saying hello you big MANLY MEN.I just spotted this comment on a navel-gazing thread about how we shouldn't say "guys" because it's not gender neutral and couldn't resist replying.
These self-involved dipshits really think they're the good guys (ha) in this situation don't they?