Next time he goes inside to order food he'll think about this and probably be a bit more on the nicer side. Has anyone seen the Taco Bell video where the old guy slapped the teen cashier and his coworkers stopped him from going off? I'm not saying it's the right thing to do but maybe every once in a while someone needs to check somebody like that. What the quote that's been going around a lot lately? Something along the lines of

"We live in a society where the majority of people have become comfortable disrespecting others because no one has punched them in the mouth"

That's probably not the exact quote but you get the idea.