Final answer:
Susan's views of Mayan families in Guatemala reflect ethnocentrism, the belief in the superiority of one's own cultural norms.
Step-by-step explanation:
Susan's views of Mayan families in Guatemala reflect ethnocentrism, which is the belief in the superiority of one's own cultural norms. Ethnocentrism leads people to judge other cultures based on their own standards, considering them unhealthy or inferior. The belief that separating infants and adults at night is healthier than co-sleeping is an example of ethnocentrism.