Theorists believe that much of what has been written about culture in the western world is eurocentric—that it is based on the uncritical assumption that european culture is the true, universal culture in which all of the world's people ought to believe. this is called?

Eurocentrism or Eurocentricity.

Explanation:

Eurocentrism is the term that theorists use to refer to much of what has been written about culture in the Western world based on the uncritical assumption that European culture is the true, universal culture in which all of the world's people ought to believe. It is a worldview that only takes into consideration Western Europe's culture as the only possible point of view.

sounds good to me mate!