Worst interview experience - Software Developer Qualcomm Employee Review

I feel obligated to post this as it's still on my mind. I interviewed for Qualcomm over a year ago in their cambridge office. The interview was with 3 people, 2 of which were nice however the mid-level interviewer was incredibly rude to me. I was nervous and struggled to answer questions I usually know the answer to and I was ordered around in ways such as "sit down." "Dont say anything." To make matters worse, at the end of that stage of the interview, the interviewer asked me my ethnic origin and also mocked my credentials as a junior at the time. Overall my worst interviewing experience.