I don't believe any culture is higher or lower than any other - they may not even be comparable. Culture is governed by history & geography, and as unique those are for every culture in this world, they offer perspectives in their own unique ways.
@Classical : I'm not sure if we can call the kids hand-paintings as "culture". The first search result of the definition of culture as returned by your organization's popular search engine is as following : "1. the arts and other manifestations of human intellectual achievement regarded collectively.
"20th century popular culture"
synonyms:the arts, the humanities; More
the customs, arts, social institutions, and achievements of a particular nation, people, or other social group."
I don’t believe in “high culture”. If you want to label some art as “better” than other art, you can. But you can never prove something is “better” or “higher” because those are labels that can’t be measured
It does not need to be proved to everyone, since the ideas were never intended to be easily understandable at a shallow level. High culture can be measured by preservation throughout centuries in timeless classics works, deserving detailed analysis and critical influence.