According to Webster's, a bigot is "a person who strongly and unfairly dislikes other people, ideas, etc." What is a medical bigot? A medical bigot strongly and unfairly dislikes other people, ideas, etc in various fields of medicine. A medical bigot sees things in black and white, devoid of color, or complexity. A medical bigot wants simple answers, the simpler the better.
"A strong or unfair dislike for other people, ideas, etc." perfectly describes the bigot. A bigot has a strong dislike for strange persons, unfamiliar ideas, difficult questions, challenges, controversy, etc., preferring the safety of their current knowledge, and position. Medical bigots don't make good scientists, because scientists are always ready, willing and able - eager even, to challenge their current knowledge.