Having worked in retail/service industry for about 5 or 6 years, the amount of people who are 40 or 50+ freaking out compared to 30 and under was no comparison. Like 100 to 1 old people bitched way more.
$1:
There is no incentive to be a good person. You have to go out of your way and put yourself at a disadvantage if you wish to not be a douchebag.
I disagree, I've had mistakes made by service people and typically if you're understanding and not a dick about it, they'll go out of their way to make it right.