I’ve heard people in public restrooms using their phones while using the facilities.
There is nothing more rude and obnoxious, IMO.
There was a Dilbert strip where the robot at the conference table turns its TV face over to Wally whose face appears as he says, “Greetings, mere mortal carbon units, I’m speaking to you from the third stall in the men’s room”.
The boss grimly observes, “This is what happens when our technology outpaces our etiquette!”
Meanwhile the Wally screen face is visibly straining.