Ethnocentrism is best described as the belief that:

Ethnocentrism is best described as the belief that one's own group is superior to others. This concept involves evaluating other cultures based on the standards and values of one's own culture, leading to the perception that one's culture is the norm or the best. Such a viewpoint can result in prejudice or discrimination against those whose cultural practices, values, and beliefs differ from one's own.

This belief directly contrasts with the idea that all cultures are equally valid, which promotes cultural relativism and understanding. Additionally, while celebrating differences and promoting coexistence among diverse cultures are essential for fostering positive intercultural relationships, these concepts do not align with the ethnocentric perspective, which inherently lacks appreciation for the diversity of cultural strengths and contributions.