In this particular case I have to disagree with you Andy, while I don't often use Public Facilities, when I do I use thst as a chance to make sure my Carry Piece hasn't suffered from some thing. Things like the Safety being off etc. it's just a good time to check things out. With any luck I'll never forget anything of importance in the Head.Let this story in the OP be a reminder to all who conceal carry...
Find a good holster and belt combination so you will not have to take off your holster and handgun or un-holster your hand gun , when using the restroom / bathroom.
I understand that a good holster and belt is expensive and that the trial and error of finding a good holster and belt is sometimes more error than trial...so....
Practice going to the bathroom / restroom with your concealed carry outfit at home , so you know how not to leave your handgun in the stall or wherever...
Andy