Interviewer - "That's impressive Daniel. Now can you invert a binary tree on the whiteboard?"
Recently I went through a phone screen by a gentleman I imagine to be in his 50s or 60s and it was an immensely pleasant experience. No gotcha questions and any time I mentioned how his problem reminded me of so-and-so tech he would gush in excitement that he also worked in that tech Compare to a recent interview with the world's best employer (tm): the interviewer was young, was upset that my solution wasn't written…
It’s at this point that I would end the interview and let them know it doesn’t feel like it would be a good fit.