I've had my fair share of nervous smiles, glares, stares, frowns, and gasps of exasperation or indignation. I've endured the indiscernible twitterings of which I am the topic, obvious by the unapproving sideways glances in my direction.
I've watched some step back in horror as we meet in the doorway. It's clear in that fleeting moment that they believe one of us is entering or leaving the wrong place. I love those incidents... funnier than hell...
I came out of a multi-stall bathroom once (I was the only one in there at the time), only to find a woman waiting outside. She briefly made eye contact then breezed past me and into the bathroom as I cleared the doorway. Interaction between this woman, her companion and the wait staff indicated she was a regular, so she knew the bathroom had several stalls, and the main door did not have a lock on it. So I wondered, why was she waiting for me to come out of the bathroom before she went in?
Quite often, the bathroom is the last stop before I walk out my door in hopes that I will not have to pee again before returning home. I look for single-use restrooms. If there are none, I note the times when the bathrooms appear to be less likely crammed with women, and I will go to a stall that is as far back as possible. Or I will go to a bathroom that is somewhat out of the way - the ones that no one wants to walk so far to.
When travelling alone... because my STP is "always ready," I usually just find an out of the way place to pull over, and water the grass.