Uber Software Engineer(Internship) interview questions

The whole interview process around 45 minutes. I was surprised as the only technical question asked was showing how to create a HashMap from scratch. The interview however didn't go so great as the interviewer told me I was making feel uncomfortable. I couldn't really understand why. After addressing the issue, we continued with the interview but ended up leaving early. To this day I don't know what I did wrong. I shared this experience with my classmates and they also found it very bizzare.

Standard big tech interview process 2 technical round interviews interviewer introduces himself, we move onto a technical question or two. concludes with questions about the company technical questions varies from lc medium to hard