No, it isn't common and screams volumes about the individual and organization that employs him. Ignore, and walk away.
I was working with a mid-sized business and doing interviews to hire people into the team a number of years back. One of their dev leads had phone screened a candidate, decided he was worth bringing on-site for an interview. Had the guy come on-site (the candidate drove 2 hours to get there), we all sat down and because the candidate was nervous he totally flubbed the first 2 questions. To be totally honest I am not sure he understood one of them as I was even questioning what was asked. This dev lead stood up and said thanks but you are not a good fit, bye and walked out of the room, not even showing the candidate out. I was dumb founded and shocked, I had never seen something so unprofessional. Worse yet, I had worked once before with the candidate so he turned to me and said wtf, is he serious?
I had a top recruiter I knew call me the next day and ask if it was true (not sure exactly how he heard so fast), I confirmed that it was indeed true. He stopped doing all business with all divisions of the company that week and would tell candidates about that experience, steering them to other employers. I asked him why he would do that and he said if he sent a candidate into that situation it would be irresponsible and would destroy his reputation. And placing a few candidates there a year wasn't worth it as plenty of alternatives were available. Ironically, I also stopped working directly with that company shortly after that experience as the fact that the management did nothing about it spoke volumes to how they felt about their employees and contractors.
That dev lead left the company sometime after I did and that situation has followed him as while I don't speak with him or work with him I have heard recruiters and applicants alike all say they refuse to interview in his division where he is now because of what they have heard. Ironically, he went into financial services, although I doubt that is a correlation. To be totally honest, the guy is pretty damn smart and good at what he does, but that doesn't excuse being an ass.