Well, as soon as I saw parent, I thought like he's telling my story!
I had the exact same experience, and I've done maybe 50-60 interviews so far, and I interviewed at least that many people, your interview was the worst.
Our interview took about 60 mins, and after asking a string DP question, basically you returned your daily job, no feedback, no questions, and took at least couple of phone calls during the interview.
I understand you now acknowledge that was a bad thing, and I appreciate that, but again, it was beyond rude IMHO.