When a customer asks you to request the customer behind them move back as they're making a PIN purchase (and with the type of card, I didn't have a choice as to whether it would BE a PIN or not), don't just stand there and stare at them.
And if a situation is escalating because your customer DOESNT WANT THE NEXT IN LINE TO BE ON THEIR ASS?
Maybe you could do SOMETHING to de-escalate it?
Yes, I know I handled myself badly. But you know what? If you had done SOMETHING--ANYTHING--maybe it would've turned out differently.
Also, separate suck: When I go to restaurants (including fast food), I order no-ice in my drink. Because frankly, the ice tends to be disgustingly filthy. The ice makers are seldom cleaned, same for the buckets used to bring ice from the maker to the ice chest (which is ALSO seldom cleaned). I'm far from a germophobe, but it grosses me out.
So, when you accidentally make my drink with ice (not a big deal itself, it happens--I've done it myself), and I point it out, please REMAKE the drink, and don't just scoop the ice out? (I don't expect the worker to know why I don't want ice--but people have their reasons for not wanting something and imo, picking/scooping/dumping it out is unacceptable if you goof and make it with the undesired object).