Would you rather they call you Lebowski?

Sorry. That was dumb. Cracked me up, though.
"Guys" seems pretty gender-inconclusive. Like if it's used in "guys vs. girls," it's clearly masculine, but if it's used like in "hey guys," then it seems pretty neutral. I wouldn't worry too much about that. "Dude," however, definitely strikes me as masculine.
The one that personally bugs me is "bro." I've got a few people who address me that way. I know they're trying to be friendly, and I know they don't know about my gender issues, but it stings nevertheless.