Older doctors were literally taught that black women have a higher pain tolerance. This in part originated from an early gynecologist doing experiments on black women slaves without bothering to give them any anesthetics. His justification for it was basically that they could handle the pain, and there are doctors practicing medicine today that still belive it.
You might actually look into how long that was taught and pervaded into medical attitudes, how little women’s anatomy has been studied compared to men’s, and assumptions made about care for black people and women compared to white people and men, respectively, before making comments like this.
I don’t have the time to look it up for you, but I will recommend the book Bonk by Mary Roach for the anatomy stuff. You will be very surprised.
A survey of medical students in 2016 found the same trends in actual beliefs, long after the data disproved the theory.