Usually, the only people I run into who introduce themselves (socially) as Dr So-and-so, are medical doctors. To which I reply, "Oh, I'm Dr. WornDown." (I have a PhD in chemistry).
That shit annoys the hell out of me.
PhDs, not MDs, are the top of the academic pyramid.
IMO, it's the medical profession trying to gain legitimacy. Remember, just a little over a 100 years ago, physicians ("doctors") were largely untrained, and uncredentialed.
Medical journals are the only ones where you see the authors have their credentials (and the medical profession LOVES their credentials). That NEVER happens in the sciences (I don't think the humanities either)
Funny story:
When I first got custody of my son, he hadn't been in school for almost two years (long story). When I got him, it was just before he was to start 8th grade in the town I lived in. The guidance counselor set up a meeting at the start of school to discuss his education needs (he didn't need any, he just needed to go to school).
Any way...Turns out the principal's last name was the same as my first. The guidance counselor introduced her to me as Dr. X. (Education)
I was soooo tempted to say, So am I! But, I needed her cooperation, and didn't want to put in a bad mood....
Me: BH (50); exW (49): Way too many guys to count. Three kids (D, D, S, all >20)Together 25 years, married 18; Divorced (July 2015)
I divorced a narc. Separate everything. NC as much as humanly possible and absolutely no phone calls. - Ch