What I _wasn't_ prepared for was 4+ of those questions in a row, and _zero_ questions about my experience, or strengths, or anything else. The questions were more of the type "when did you stop beating your wife?". In retrospect, I think the interviewer already had someone they wanted to hire, but were forced into it by HR due diligence or something.
It's possible that's what happened here and the interviewer also just wasn't very good. Some people just really suck at interviewing.