That’s not what parent is saying. Yes there is likely a an innate variance in human intelligence, but we can’t believe this is the sole reason why society considers people to be “intelligent” or “stupid”. Many people with lower IQs and academic performance would perform differently when raised in a different environment. People who are of lower socioeconomic status often times perform worse than wealthier counterparts. People in of lower socioeconomic status are often in that situation because they have been systematically oppressed. So saying that people are either born stupid or smart without acknowledging societal and environmental factors is essentially saying that poor people are poor because they are stupid, which is certainly eugenicist.