The purpose of this study was to examine the factors that influence the perceived social costs of interacting with gender-atypical peers. Our study examined the relationship between peer processes and gender socialization by exploring situational and individual-level factors that could affect the relationship. Middle school students (N = 107) completed surveys containing items pertaining to gender identity, egalitarian attitudes, and social support. In addition, participants were asked to rate a series of questions regarding hypothetical peer rule violations. We hypothesized that different domains of gender identity would predict adolescents' perceptions and cognitions about gender-atypical behaviors and traits. Results revealed that early adolescents perceive higher social costs for male peers who violate an appearance-based gender norm violation when compared with female peers.