> I'm sure the same is true of doctors too.
Dentists are doctors.
Dentists are doctors.
Common vernacular is commonly wrong, we get it. Yes, you can be referred to as "Doctor" with a PhD in Physics, English, or History.
Guess what? If there was an emergency on a plane and the staff called out for a Doctor, and somebody with a PhD in structural engineering stood up, you'd be yelled at.
Anyway in a pinch you can be fairly sure that any non-medical doctor is extremely (maybe narrowly) educated, whatever that's worth. A young MD might be less appropriate.