This was a ways in to the interview and I do not think I was being as asshole. I didn't say it in a mean way or anything. I was laughing about it and said I had

This was a ways in to the interview and I do not think I was being as asshole. I didn't say it in a mean way or anything. I was laughing about it and said I had no clue and wasn't something I was interested in. He came in ready to grill me and I did not then, nor do I now, see any benefit to adversarial interviews. I said I knew nothing when he asked about number theory. I never tried to cover up anything in my gaps. The interviewer proceeded to ask questions about it. I don't have a CS degree, I have never claimed I did or that I enjoy or even want algorithms heavy jobs. This was an internal tool to manage datacenter component ordering. I would never ask a bunch of questions about something borderline esoteric to someone that has already said they don't know anything about the field. I have had plenty of interviews where I am doing the hiring and when I realize the candidates are in over their heads I politely ask some fielding questions (like, do you know number theory is great, and fair) and then just conclude the interview kindly or toss them a different set of questions depending on how the interview has been going.