boys are more physically aggressive—more likely to shove and hit one another, and they show a greater interest in stories and movies about physical aggression. Girls, in contrast, are more “relationally” aggressive; they try to hurt their rivals’ relationships, reputations, and social status—for example, by using social media to make sure other girls know who is intentionally being left out.33 When you add it all up, there’s no overall sex difference in total aggression, but there’s a large and consistent sex difference in the preferred ways of harming others.

