Idk, "we make [my edit: great] sandwiches", which sounds like a great mission, seems very much entwined with who gets to eat said sandwiches - especially if they're delicious. Since if you are denying certain classes the right to enjoy your awesome sandwiches, your sandwiches probably aren't that great to begin with.

If I steel man your argument about having segregated counter space - that they'd excuse the segregation because if everyone has separate counter space to eat the sandwich the underlying differences don't matter -, what I'm left thinking about is that, well, the experience of having a great sandwich also has to do with the environment in which you eat it. Who wants to eat a delicious sandwich when you have to sit at a crappy table, with crappy chairs and bad service? No one, that's who.

And then we're back to my original point about artificially constraining the market for awesome sandwiches.