Okay, here's one. Parents who let/encourage/instruct their kids to use the handicapped door switch instead of just opening the door. These kids love to do it but they generally love to do it with all their brute baby strength or run full tilt into the thing. I've seen them barrel around actual wheelchair bound citizens to get their button-pushing glory and fight visciously with siblings for the honor.
So is it out of line to ask yuppie parents to stop teaching their kids to do this? Those buttons are in danger of breaking from baby thwacking and it takes forever to get them fixed. That's not a baby on that blue button. It's a handicap symbol. Are the kids learning to be helpful of learning to be lazy? And anyway, eventually it might serve their interests to have them learn to open a door... for when those buttons finally break.