Reject by Green Day reflects themes of nonconformity, rebellion, and self-identity. It is a powerful anthem against societal pressures and the expectations to fit into conventional molds. The song's lyrics express frustration and defiance against being judged or labeled as a 'reject' by society. Key poignant moments in the song involve lines that emphasize individuality and the rejection of societal norms. Green Day uses raw and passionate language to underscore the emotions of feeling marginalized and the resolve to stay true to oneself despite external judgments.