Sentence:  Professor Gordon considers himself a "<WSD>race realist</WSD>." Consequently, one must ask: Has it ever occurred to your intellectual realist to question the "scientifically neutral" criterion or criteria upon which the institution of those "neighborhood lines" were based in the first place? 
Meaning of the word marked with <WSD> tags:  One who believes that the human species is divided into observable races. (from 20th c.)