doctor doctor

A patient identified himself as a doctor to me, the front desk, the appointment manager, etc. Everybody knew he was a "doctor" before he even set foot in the office. Today when I asked him what kind of doctor, he said he's a biochemist with a PhD. Now that may be true, but it's irrelevant and a ploy to pull rank. I find that MD's never identify themselves as such. The ones who try to pull rank are the ones without rank.