Unified Software Engineer interview questions

The phone interview was pretty normal until the interviewer started asking some algo questions. The first question was incredibly easy, one that anyone who did any prep at all would know, so I explained how I would solve it right away. The interviewer paused for a while and then asked if I heard that question before. I said, yes. Loooong pause, maybe literally 5 minutes. Then he asked another question. This was another easy question (like one of the easier questions in Leetcode easy). I knew how to solve this right away so I explained the solution. The interviewer asked if I had heard of that question before. I said yes. He got obviously upset, paused for a while, and went straight to "Do you have any questions for me?" When I asked what happened, he said I was being dishonest by not revealing upfront that I had heard those questions before. I think that is ridiculous but anyway...both of these were incredibly easy questions, probably taken straight off Leetcode or CTCI, so be warned: if you have done any sort of prep, you probably have heard their interview questions before. Try playing dumb during the questions so no one suspects you of having done any studying.