[Wowfunhappy]

Unless we're discussing some all-day affair, surely it makes more sense to just finish out the interview? You've already cancelled your other plans, gotten dressed up, and made the commute. None of which offsets the sunk cost fallacy, but:

• What if you're reading the room wrong?

• What if one of the other interviewers likes you, and will be hiring somewhere else in the future?

• What if a different team at the company has a position in the future?

• What if you used the time to practice interviewing? (Even if the conditions are less than ideal.)

I think all of that combined is worth an extra hour?

[digisign]

O.P. was clear I think. And the other percent or two allows for some of your exceptions. But I'd push back at practicing "doormat" skills. Life is too short.

[lostdog]

OP could easily have been wrong. It's possible to have an interviewer that is just rude, but will still judge you fairly.