As customer misbehavior occurs frequently in service encounter, both managers and researchers begin to pay attention to this phenomenon and its harms. However, they mainly focus on how to prevent the event and ignore the important intervening role of employees and fellow customers in dealing with the customer misbehavior. Therefore, based on the survey data, this paper delves into the impact of interpersonal interactions among undesirable customers, fellow customers, and employees on fellow customers’ experience and attitude on encountering customers’ misbehaviors. The paper concludes that the negative interactions between fellow customers and undesirable customers, the positive interactions among fellow customers, and interactions between employees and customers all have significant positive effects on fellow customers’ experience. Interactions between employees and customers can also strengthen the effect of negative interactions between fellow customers and undesirable customers. Besides, service experience plays a vital mediating role in the influence of interpersonal interactions on fellow customers’ attitude. These findings provide important guidance for managers to motivate employees and fellow customers to participate in the control of customer misbehaviors.