

I mean, the guy who used the restaurant term was giving directions directly to a restaurant.
A “fast food joint” is not a restaurant in that sense. Nobody with any common sense would expect a bunch of kids working their (likely) first job for spending money to be up on, or care about, restaurant jargon.
That’s an absolutely fair point.
Nevertheless, my overall point stands. Each fast food place I worked at had their own chain specific jargon. Nobody used, or cared about, sit-down restaurant jargon.