I used to live in a high-rise on the 11th floor, so I took the elevator a lot (almost always took the stairs down, elevator up). It could be so frustrating! Most people were polite, but a few stand out in not a good way. Generally people would let those who'd been "in line" get on first, but there were some parents who would let their kids run ahead of everyone to get on it. Even when the crowd around the elevator had been there awhile, this family would come in and the kids pushed through everyone..they didn't even hesitate. That, IMHO, was bad parenting.
As far as letting disabled people board first, I get that. But there was a guy in a wheelchair who'd get upset if anyone was on the elevator. In his opinion, once he got on everyone should vacate the elevator. He complained so much to management that they sent out letters to the residents, instructing us to do just that. No one paid attention; it was a ridiculous request! (FTR, the elevators were quite large, plenty of room for a wheelchair and other people.)
I don't miss that.
Edited to fix typo