I know several professors (so they have PhDs) that are absolutely idiotic or regressive about things outside (and sometimes within) their PhD interests. For example: I have one who has been begging me to work on his study about language in autistic children, and I keep refusing because he has said “neurodivergent people don’t have empathy”. That’s a massive misunderstanding of what neurodivergance is, and the way empathy can present.