Extremely rude and disorganized; the interviewer forgot to call me at the designated time, so I called the HR person who scheduled the phone interview 30 minutes in to check what's going on. He actually had the nerve to blame me for calling him late about this, and scheduled the interview 3 business days later. The interviewer was not much better in terms of professionalism; he asked what CS languages I know of, and distinctively asked questions about languages that are not listed on my resume. After a few questions where I couldn't answer the technicality of a language I did not know, he proceeded to tell me that I was basically wasting his time. If you plan on selecting an interviewee who clearly has labeled he does not know the language you desire (and failed to label it in your position description), then stop wasting my time by even trying to schedule an interview with me.