I think you're right. My initial response was to say that I'd just get up and leave, but you're right. You're already there, you've spent the time to prepare a

I think you're right. My initial response was to say that I'd just get up and leave, but you're right. You're already there, you've spent the time to prepare and get there on time, etc. Might as well get as much benefit from it as you can. So use the time to hone your interviewing skills and deal with the hostility, while knowing full well that you are not going to take the job. But you'll work on making yourself as appealing as possible. And you never know if one of those interviewers will admire how you handled the situation and recommend you to someone else, or you'll come across them in another interview years later. So yeah, make the best of the situation and use it to your advantage.