It's too vague to be helpful. For example, the "dogmatic principles" criticism. The interviewers could have asked "Is security a good thing?", and he could have answered "No". Or the interviewers could have asked a silly question like "Tabs or spaces?" and berated him for answer answering "Spaces". Context is absolutely important.

And if we take the story as truthful, he just went up and said he's done with the interview, without explaining the reason to the room. He pretty clearly didn't explain to the room that he did not feel that he was a good fit, and did not want to further waste anyone's time. That's the only logical explanation for why the lead had to track him down in the elevator, to understand why the interviewee decided to end it.