AMD Intern interview questions

I applied online and was then reached by hiring manager. It was for testing role. He asked questions related to programming. It was not prepared well, it was an impromptu interview.

About 10 minutes of personal/behavioural questions and the rest was technical. Once the technical questions started, I fumbled one of my answers by giving Mb instead of W as units and the interviewer seemed condescending. This made me feel bad as the interviewer was condescending afterwards and it was my first interview ever. After a while I think they gave up on me and were just joking around with me (or at me).