First question was to find permutation of a string. Then the interview asked about React components. Then he asked a Question on Streams API which I couldn't understand properly and hence asked him a very questions on that. In return he said, and I quote, "I am here to ask you questions, not you". And mind these were not irrelavant questions, questions which you need to answer for better clarity of the problem statement. After that I told him I am not understanding the question to which he replied and I quote "you are not understanding because you dont know. I knew you had zero knowledge of all these the moment I started taking your interview". This is the point where I gave up and lost all my positive attitude towards the interview.