I didn't really understand the bathroom objection when it was Google Glass, and I don't really follow it now. I've got plenty of problems with the general idea

I didn't really understand the bathroom objection when it was Google Glass, and I don't really follow it now. I've got plenty of problems with the general idea of camera glasses, but in terms of bathrooms... The wearer can't really record anything he/she can't directly see already. Is the concern that the guy at the next urinal might crane his neck over the divider and film your junk? Would you consider that acceptable behavior if he didn't have camera glasses on? Is the worry that someone might capture you entering or leaving a bathroom stall, or record your back as you stand at a urinal? It seems like a regular old cell phone would be a more effective way to take sneaky pictures or videos, since it doesn't involve popping your whole head under the stall... It just feels like doing anything truly unpleasant with camera glasses would require a serious breach of standard bathroom etiquette, and even considering how shitty the general public can be, I've never experienced that level of bad behavior in a public bathroom in all my years.