I am a panel member for our congressional district. For God's sake please do not refer to the panel members by their first names (from the name card in front of them) when introducing yourself.
This happened twice during our panels last week! My mother would have slapped me square in the jaw had I done that as a teenager.
We get that from time to time (I serve on my college's scholarship committee for incoming freshmen, and all candidates must undergo an interview). I can only conclude that young people are becoming more casual about courtesies like this. Usually a simple "Dr. LongAgoPlebe, please. And can you tell us...?" does the trick, but last spring we had one "dude" who just did NOT get the cues from "Call me Dr. OldCurmudgeon, please..." and "It's Dr. YoungEarnest, please...". He did not get the scholarship, but - true story - he enrolled in my fall intro bio course. One day, after class, he approached me and we had approximately the following conversation.
Him: Hi, Jane, I don't know if you remember me, but I'm Stu Dent, I interviewed for a scholarship but didn't get it, hey, how are you?
Me: It's Dr. LAP.
Him: What?
Me: You need to address your college instructors as Dr. So-and-so, or if they don't have a PhD, Mr. or Ms. So-and-so. I'm Dr. LAP.
Him <bewildered>: Um, okay, Dr. Jane...
Me: Excuse me? <maintaining cheer and smiling but edgy> What did I just get done telling you?
Him: Dr. LAP! Got it! So can I ask you about <blah blah blah>
...
We finish the conversation and WHAT do you suppose he called me on the way out?? I, and undoubtedly his other instructors, have disabused Stu of the habit of calling adults he does not know well by their first names, but WOW, what a case.