Final answer:
Derek Freeman disagreed with Margaret Mead's research and conclusions on gender in different societies, particularly her interpretation of the Arapesh and Mundugumor societies.
Step-by-step explanation:
Derek Freeman disagreed with Margaret Mead primarily regarding her research and conclusions on gender in different societies. Mead believed that gendered behaviors were culturally constructed and varied significantly across cultures, while Freeman argued that gender differences were rooted in biological factors. Specifically, Freeman criticized Mead's research on the Arapesh and Mundugumor societies, suggesting that she misinterpreted the data to fit her preconceived notions about gender.