Allport ignored sexism though it targets about half the population

Evidence

Allport defined the target of prejudice as a social group in general – for example, Jews, African Americans, Latinos, Japanese, and poor people. His emphasis on negativity was in part a byproduct of the extreme prejudices to which he paid the most attention, such as those that produced the Holocaust and lynchings. … In contrast, he ignored (with one brief exception, pp. 33–4) a prejudice that targets about half the population, namely sexism, whose nature poses a critical challenge to defining prejudice as an antipathy. — John F. Dovidio, Peter Glick, Laurie A. Rudman, On the Nature of Prejudice, 176

Categorization

• CANDY: A fun trivia line: the foundational text on prejudice barely mentions a prejudice affecting half of humanity.
• ADDENDUM: Directly relevant to ‘Complaints About Immodesty Go Way Back’ — the omission of sexism from classic prejudice theory parallels the historical invisibility of gender-based moral panics.