Qualcomm R&D Software Engineer interview questions

Had a phone interview, followed by onsite. In onsite interview, there were 5 rounds. One of the interviewer did not show up. The prev interviewer tried to call 2-3 persons to know about this guy but no one picked up the call. So I was asked to wait in the reception. After 20 minutes, one guy (next interviewer) was walking towards me, I assumed he should be the next interviewer , so stood up and wanted to greet and make sure he is the right person, but that guy told me to pick my belonging and follow him. I dint expect this rude behavior. Also during the interview he was not interested to listen what I am telling and was looking into his phone. The other interviewers were friendly.