Honestly I'm patient with subway people, usually when I go there's only 2 people handling like 5 customers at the same time and I don't know that feel but I'm so sympathetic, and the machines are loud so they can't hear and neither can I because I'm pretty much deaf, and I can see on their faces, the "im taking up this person's time because I can't get the order right oh god my boss is gonna be so mad at me" so I just go slow and repeat myself if need be because I just feel bad like shit.
And since I'm a regular ik who's new and who isn't, and it's the newbies that are the most awkward. And the foreigners too, the foreigners who can't understand/speak English well along with the loud machines.