I answered the first interview which is the technical round. The interviewer was adamant. Whatever I was answering he used to cut me in between and ask a new question. His vocabulary was not clear. He asked me one question which was out of my scope. He asked some stupid questions. He was asking very generic questions and was expecting specific answers. Basically his questions were not clear and I had to ask him to be more specific, may be that's what made him feel offended. Please get some better interviewers.