I hope she kneed you in your very masculine balls.

You can't really assume someone's gender nowadays

"Did you just assume my gender? Hulk smash."

Don't feel bad. You were just trying to do the right thing.

Don't even stress it OP. People who look like that do it on purpose and I'm sure they get comments like that all the time. If they get mad over it, maybe they should take some classes on anger management.

That coulve happened to me

Maybe next time just keep quiet? Men don't usually walk in girls locker rooms in broad daylight so there's probably more to the story -- which you found out the hard way.

you should have just told her that you thought it was the men's room!

??????

Too bad. You look like "x" expect to be mistaken for "x". People are too freaking sensitive. I get the occasional "sir" on the phone because I have a deep voice for a woman. Had the same in person when my hair was up under a hat when I worked at a theater. I've done the same with customers whose voices are difficult to place for a "Stacy" and get it wrong sometimes. The customer rarely, if ever, cares. This whole "assume someone's gender" needs to stop. We go on visual and auditory cues. If it's a mistake, politely correct and get on with your life. Shake it off and realize most people don't mean offense.