Do you challenge people or just keep quiet

I was waiting outside Burger King on St Andrew's Street once. A guy parked on the pavement wound down his car window and threw his wrappers on the floor, even though he was parked next to a bin. An old man, picked them up, tapped on the driver's window, and threw the wrappers into the car. I expected some sort of row, but the driver just got out of his car and put the rubbish in the bin.