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> Try upsetting a doctor by calling him/her "mister"/"miss" repeatedly.

I know a ton of CS PhDs, they never like to be called doctor or introduce themselves as Dr. So and So, are you talking about MDs?

"Dr." is a title; "doctor" is noun which only ever refers to an MD.

Or a D.O.! But in general, physicians prefer the noun "physician" to "doctor".

only in the United States