While the latest oopsie by someone who should have known better didn't involve public restrooms, most of the embarrassing gun-carry incidents that make news seem to include shattered porcelain or weapons forgotten on top of toilet tanks or paper holders. No matter how distasteful the subject matter, it never hurts to remind folks of the importance of correct Concealed Carry Potty Procedures.
Nothing forces you to learn such things more effectively than a multi-day stretch at gun school where the amenities are row upon row of porta-johns. To underscore the importance, I once had the opportunity to learn from another's mistakes when a fellow student's Glock took the blue-slime-dive. Being a Glock, it was none the worse for wear after a good cleaning, and I understood and agreed with the school's policy of you-drop-it-in-you-fish-it-out. Per the safety briefing, the unfortunate individual immediately informed the others waiting in line of the occurrence and went to get his rangemaster. The rangemaster closely supervised the retrieval to ensure it was done safely. No, they didn't have any shoulder-length ick-proof gloves available.
Shoulder rigs and holsters that have their own belt independent of clothing like the SmartCarry or my house holster are no problem at all. IWB's that use your clothing to supply some or all of the holster's retention capability are the trickiest to manage. Rebuckling your belt after sitting down while keeping pressure against the holster with your knee keeps everything where it needs to stay. And no "wide stance" jokes, please; I have two X chromosomes, thankyouverymuch.
Men can get away without having to drop their drawers all the time, but us gals aren't so lucky. Plus when using the row-of-stalls type of public facility, we're more likely to encounter the small child in with mommy who peeks under the divider. Then an IWB is easier to hide behind your purse than a belt holster. Unfortunately, there's also a tiny chance somebody might glimpse something (hopefully) accidentally through the gap alongside the door. Cover it up whether there are kids present or not.
Best of all are the one-holers like they have at Starbucks. All the privacy in the world.
And if despite your best efforts your sidearm should escape, NEVER EVER try to catch a falling gun. Modern carry-suitable guns won't ND even if dropped on an exposed hammer, and a CLUNK is always better than a BANG under those awful circumstances. Keep those firing-pin springs fresh, folks. No gun make/model that has any history of going off spontaneously when dropped should ever be carried.
And I absolutely consider dropping your gun in the can to be NEGLIGENT.