An american traveling abroad observes locals eating chocolate covered crickets. she expresses disgust to her traveling companions. she is exhibiting:

She is likely exhibiting ethnocentrism. This is being defined as a way of showing judgement towards to other cultures based on their own standards that they are accustomed of or in their own culture. The American likely acted that way after seeing crickets to be eaten by locals because it is not normal or a tradition for their culture to eat bugs or even cover them with chocolates as they eat it.