Somehow, some of my students think it's cool to call me by my last name only. It started about two years ago. I took aside the student who seemed to be the instigator, and told her to pass the word that I prefer to be addressed as "Dr. Corcoran." It stopped for awhile, but has picked up again. Yesterday, while preparing for a major assignment, a student called out, "Hey, Corcoran!" I walked over to where she was seated, calling out while I walked, "Yeah, Studebaker?"
"My name is Sally," she said.
"Well, my name is Dr. Corcoran," I replied.
"Yeah," she said, with a sneer. "Oh," she added, when she saw the hard look I gave her.
I am generally liked by my students, and get high evaluations. I am friendly and keep generous office hours. But I don't pal around with them, and keep a professional distance from them. I probably didn't work fast enough to nip this latest example of disrespect in the bud, but after yesterday's incident, I've had it.
