NO. I have no issue with old and handicapped people moving slowly, because that's not something they can control.
However, I do get angry when people block the bus door looking for changes or passes, when they should have had it ready while waiting for the bus to arrive. It doesn't matter if they are old or young. If you are 89, you still have the ability to find your money/pass at the bus stop. It has nothing to do with age or mobility (unless the bus arrives immediately after you arrived at the stop). It is simply being lazy, irresponsible and wasting everyone else's time.
You stated one of the major issues related to loading of vehicles for all transit systems.
One of my biggest bitch is riders not having their fare ready to board once the vehicle shows up when they being standing there for a few minutes or more. How many time do we see riders looking for their transfer let alone any fare media once on board?
If the person is carrying a lot of items that is preventing them from having fare in hand, they are allow some leeway as well having a child in tow. The rest are too lazy and fail to understand that they are holding up service on the line as well causing delay in moving everyone.
Watching riders using the new cars is unreal as why are they buying their fare on the car when they could do it on the platform in the first place? This would prevent the log jamb trying to pay their fare on the car. In some cases, its fraud as they are trying to not have to pay their fare as they are going into a free transfer point where they can get a free transfer for the rest of their trip.
Even riders who have the Presto card cause delays as they go looking for it once on a vehicle.
Riders who arrive at the stop as the vehicle arrives have some excused in not having fare ready, but only to a point if transferring from one line to another line.
Every age group has their slow rider and some is because they don't care. Others have good reasons, but not many.
I watch a old couple today that held the bus up and it was the fault of the driver. The driver didn't pull up to the stop correctly, not kneeling the floor for them and waiting until they pay their fare. Both had canes and bags and took the women a minute or so to put the bags down and go into her purse to get the fare. The bus was at peak load.