Great question, Chris and a good response from 2JS.
Taking a bathroom break is one of the most venerable states you can be in, especially in an isolated location like you were in. If at all possible, I always use a stall, since I can stand sideways and urinate. Since, I do a lot of international travel, I have found this to be better, since their stalls are larger than the ones in the US. If standing side ways and someone tries to enter (happened in Qatar), I can use my right leg to throw a low side kick and slam the door back in their face, buying me some time.
If carrying a back back or small carry on, I will use it to block the door. If at all possible, don’t use the urinals in Schiphol Airport in Amsterdam. The cleaning women will come right into the men’s bathroom and mop the floor right in front of you. This is most embarrassing to me and I never got used to this, same way at Charles-De-Gaulle.
If you have to take a crap and carrying a handgun in a hip holster, don’t take the gun and hang it on the little hook on the stall door. A co-worker did this and a cleaning guy, hit the door with a broom and the weapon fell on the bath room floor and slide out under the door, while his pants were down. Not good.
If I walk into a crowded bathroom, I leave, especially during international travel where all Americans are targets. I can always find another place. Usually, the bathrooms near the first class lounges are the ones less used, since they are away from the main terminal.
Some of the worst situations in the states are bathrooms at stadiums. Crowded conditions and drunk NFL or MLB fans are a witch’s brew for fights. The best advice is to be situationally aware, as 2JS stated.
If in a location where you are not carrying any type of weapon, look around and check what is available. I know the cleaning people in international airports area little sloppy about locking their cleaning closets or actually leave the brooms and mops in the corners. Their handles are better than nothing and in the states, it’s the same way. Most males wear a belt with a buckle, especially those from south of the border, rip it off and use it as a modified mace, always carry a well-made ink pen, always good for close range stabs. Desperate measures, but, better than nothing.
Good question, Chris and I would like others to offer some suggestions. Honestly, I have always considered bathrooms to be extremely hazardous.