I stood right at the counter, made eye contact with both the waiter and barista and waited as they hustled and bustled. They stared at the counter any time they came near me and I watched as no less than ten beverages were prepared for other customers, all while I was ignored.
I began to look around for a line or designated "ordering spot", but found none. I looked back at both men, looked around again and watched as someone standing right next to me, who'd come in after me, had their order taken.
I reached the conclusion that for some reason, I was persona non grata. I have literally never been treated this way in my life. I'm not sure why I was deemed not cool enough to give them my money, but luckily for me there are plenty of similar/better places nearby, so I won't have to find out.