First of all, Atleast you have to schedule interview with some senior engineer than the interviewee. Next You need to train engineers how to take interview if they are interviewing someone who has more experience than interviewer. I think he was on a bad mood in Saturday morning. Kindly don't force interviewer to go for interview if he is not willing to. Thanks for the worst weekend morning. I don't wanna work with those kind of people who is not ready to answer if answer from candidate is not relevant. Interviewer was googling the question and answer and looking for specific words in answer not even the correct explanation.