Allport already saw prejudice as driven by internal development, not only learned imitation

Evidence

Because Allport wrote during a time when it was the norm for White Americans to express prejudice openly, most of his proposed routes led to prejudice toward, rather than respect for, minorities. However, he also wrote that prejudice was “not merely a matter of specific parental teaching … blind imitation, or mirroring the culture” (1954/1979, p. 318). Allport was referring to influences internal to the child, specifically emotional/cognitive stages of development and internal motivational influences such as the need for status and identity. These two processes were less well formulated but foreshadowed current research and theory. Thus, Allport described many routes to prejudice, learning being only one. — , Rudman, Laurie A - On the Nature of…, 1973