Wrong bathroom

I really hate using public bathrooms and this is one of the many reason's why!  I was in the bathroom at the hospital exiting a stall when this dude comes running in and goes into a stall and does his business, leaves the stall door open and everything then just runs out with pants not zipped up and stares at me while I'm washing my hands.  I say you are in the wrong restroom, this whole time thinking it's a guy.  My mistake...it was a really manly looking woman...she wasn't happy with my comment and walked out without washing her hands ewww! I felt HORRIBLE!!!!