I believe the correct answer is: cultural relativism.
Franz Boas, a German-American anthropologist, established the cultural relativism in his anthropological research in 20th century and defined it as “the idea that a person's beliefs, values, and practices should be understood based on that person's own culture, rather than be judged against the criteria of another”.
Therefore, Max Weber saw cultural relativism as the employed kind of value neutrality in scientific study as social scientists have to make a deliberate effort to appreciate a group's ways of life in its own context without prejudice.