She gave me a big lipsticked smile in the cafe and ordered a tall black tea. I confirmed that it would be unsweetened (because we're in the Southeast) and she said yes. Then she said "That's the large one right?" I pulled an empty trenta and an empty tall and showed her the difference and was kind of jovial about it, because that's the kind of day I was having, kind of light hearted in the cafe, it was nice. Whoah baby! She flashed anger, I guess she thought I was being a mean barista, but really I was just being light hearted and (I thought) friendly. We completed the transaction for her trenta black tea but I was shaken, no words just the total change in her demeanor as if I started the transaction with one person and completed it with someone totally different. Anyone else have something small and simple yet unsettling like this with a customer?