Symbolic interactionism believes that there are actually no deviant actions performed by an individual. It only becomes deviant when the action was performed in a setting in which the people around the individual do not subscribe to the same norms as the individual, thus it is perceived as a discrepancy in the setting. For example, nobody brings lunch in one school. And then one day, a new student decides to bring lunch with her. Everyone then found this action deviant to the norms because it is not a usual practice in the society. To the new student, on the other hand, she considers this as a norm because everyone from her previous school brings lunch with them, including her.
This action creates a discrepancy between the norms of the community in the new school and the norms considered by the new student. The new student, realizing that her behavior is not the norm, tries to fit in the community by not bringing lunch anymore. She then adapts to her new norm and rejects her old norm.