Is it normal to take someone else's teenager on a family trip with your teenager and expect them to pay for their own food?

I'm in Chicago with a friend of mine and her family. We've been here for a couple days and I've never experienced being invited somewhere and being expected to pay for yourself and I am wondering if it's normal. I didn't bring any money and now their holding it over my head as a loan. They didn't tell me they weren't paying and I needed to bring money before the trip.

Vote below to see results!