Wait...What did she just say?

We went out for lunch with some friends today. Our first choice of restaurants was closed, so we walked over to a new place none of us had ever been before. We walked in and almost everyone looked up at us like we were drifters who had wandered into town and obviously didn't know this wasn't a place for people like us. We confidently walked to the back where there were two empty tables. As we were putting the tables together so we could all sit together, the waitress comes out of the back, stops as soon as she sees us, and says, "C'mon...are y'all serious?" We all looked at each other wondering if she had actually said that out loud. She did. We left.