If you go to Wickipedia, it explains "race realism" as the claim that races are real rather than social constructs, and that racial distinctions are enduringly important because racial groups differ by nature (genetically) with regard to such important behavioral tendencies as intelligence and impulsiveness. This claim holds that racial distinctions are real and measurable, and further claims those measurable differences are based in science instead of idealism. Examples of scientifically demonstrable racial distinctions are said to include different decision and reaction times, intelligence, crime rates, and medical characteristics, such as differing tendencies toward diseases such as osteoporosis or sickle cell anemia. Critics often claim that racial realism is a euphemism for scientific racism. I would agree.