Yup, coffee places really hate it when you don't use 'coffee lingo' (which I refuse to use). Once when I ordered a 'dollar-seventy-five espresso' (that was the "double shot", but the board just listed prices, not sizes), I was asked "Have you ever had espresso before?". The guy didn't want to start a 'newbie' off with a "double shot", so it took a little while to convince him I'd actually had espresso before, and I'd be okay.