If you had a PhD, would you demand to be called Dr.?

One of the supervisors of my school demands to be called Dr. to an annoying extent. Even on the announcements she makes sure to introduce herself with her complete title and role in the high school literally every time she comes on the loudspeaker.

I just think it’s pretentious to do so. No one in my school has been witty enough to ask her what exactly her doctorate is in, but I assume it’s something as worthless as English or Education.

I don’t think I’d ever demand that someone call me doctor…
I’ve only known one other person who did this and she was a 7th grade science teacher. She would actually get really mad and say it was disrespect and whatnot even if you had just slipped up.