I've had very little problem with people in this way, but there was one incident in a shopping mall's disabled bathroom. I was changing and someone knocked on the door, in am impatient way. I don't know what they expected- I mean, really, I wasn't going to open the door and share the restroom with them... Anyway, I wasn't taking an inordinate amount of time, but when I opened the door to exit, a woman and her daughter were waiting and I got a nasty look. The woman didn't know ANYTHING about who was in there or why, and she knew nothing about me, so it was just selfish behavior on her part. To get to my point, while this woman didn't actually say anything to me, she might have gone to mall security and registered a complaint. I'm sure they would have handled it professionally and with discretion, but if they had not, or if the woman had given me any amount of grief, I'd have probably given it right back to them. Thinking about it after the fact, I realized that wouldn't have been the right way to handle it. I concluded that I would, if it did ever happen, stand up for my rights. I am, by all appearances, able-bodied, but would rather not change myself in a public bathroom stall, when I have a choice. Nobody has to know what my reasons are, but if I was asked to explain myself, I would simply say that I have a medical procedure to carry out that is not conducive to the environment of a public bathroom. I would also likely take the issue to the mall / store management if it was handled in anything but a PERFECTLY discreet, professional and kind manner. To sum up, the minor experience I had with someone who had no more right to use the private bathroom than I do, taught me to have a plan of action. I'm not an aggressive person, but I am learning, if slowly, to stand up for myself.