Yes, it was a similar experience to what people said here you arrive they take you by bus, and they drop you off then you watch a brief video then they start taking you back one by one each with different interviewers and then they make you wait in a cramp waiting room where they first pull people to be dismissed and keep the ones who are interested and go into more individual serious questioning with two main interviewers

Honestly, you probably weren't even on a United Mainline flight. I worked for a regional which flew for United and the way you described the flight sounds more like it was one of those. Sorry you had such a terrible experience though and it sucks that it caused you to decline the offer.