what are gurbinrder's options in handling this situation? what is the best option? why?

Gurbinder is invited to lunch with some new coworkers. During the meal, one of the coworkers tells a joke about a blind person of a certain ethnicity. Gurbinder politely chuckles at the punch line but is actually offended. Gurbinder wonders how to best handle the situation. Should he tell the joke teller that the joke was offensive? Should he tell the department supervisor? Gurbinder clearly believes that this type of behavior is inappropriate