[hector126]

(Throwaway as this topic can be inflammatory for those unfamiliar with the literature)

Behavioral patterns and personality traits have been pretty conclusively proven to be genetically inheritable. "Behavioral Genetics and Child Temperament" (Saudino) investigates this, as does "A genome-wide investigation into the underlying genetic architecture of personality traits and overlap with psychopathology" (Priya Gupta, et al).

There's no doubt that nurture and culture play a massive role in one's later personality and behavior as an adult, but it's incorrect to disregard genetics in this conversation. Some people are predisposed to be shy, some people are predisposed to be aggressive. Smart, critical people are able to appreciate genetic differences amongst broad human groups without letting that lead to unsavory viewpoints.