If a customer becomes angry when refused service, what should the server do?

If a refused customer becomes angry, the server should stay calm, avoid arguing or escalating, and, if the situation feels unsafe or the customer will not accept the decision, involve a manager or security. Giving in and serving the customer to placate them is not acceptable, since it would be an illegal over-service and undermines the establishment's responsibility. Maintaining composure and knowing when to bring in support keeps both the staff and customers safe. Documentation of serious incidents may also be appropriate per house policy.