Contrary to views that young people with the label of autism are incapable of engaging in collective cultural practice, this article examines how they construct identities through social interactions to belong, compete, and participate. In a multi-sited ethnography of high school students with disabilities, we focused on two students as they move across contexts of school, debate team, and home. Over two years of interviews and participant observation, these students demonstrated nuanced efforts to distance themselves from the "autistic" label. These acts of positioning illuminated how they negotiate identities with the knowledge their interactions shape how people perceive their participation in different contexts. By following them across informal and formal environments, we could see how they transition across multiple social worlds and appreciate the combined power these contexts have on youth identity. (Contains 4 figures and 2 tables.)