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With girls, the more they watched, the more likely they were to perpetuate these behaviors so there's something about the nature of this type of behavior that girls feel comfortable perpetuating, i've argued, and many others have argued, that it's really about socialization, that as a culture, we tend to condone physical aggression with boys, and say, 'Oh that's just the way boys are' but with girls, we tell them not to do that because that's not what girls do.