I said that children will learn the dominant culture they are born into, there is no alternative, but that doesn't mean they have to be propagandized to think that theirs is "best".
Yes and No, your diary portrays children learning the culture of their parents as bad, not completely avoidable, but something to be minimised as much as possible. You speak of schools and 'universal characteristics', whatever that shall be.
Nowhere in the diary you distinguish between chauvinistic elements of a culture and the cultural norms in general. You bemoan, that children look on multi-culturalism from the framework of their own background. So you want to deny them a home, a root. They should be just a tabula rasa without anything, until they themselves by random fate decide what they want. In contrast to what you write, it is this spiritual homelessness, which allows Pied Pipers to get people into a shelter, filled with hate, anger, and the will to neglect any respect to those living elsewhere.

Der Amerikaner ist die Orchidee unter den Menschen
Volker Pispers

UNESCO Universal Declaration on Cultural Diversity as a human right states that:
http://unesdoc.unesco.org/images/0012/001271/127160m.pdf

"The cultural wealth of the world is diversity in dialog"

Excerpts:
"The Universal Declaration makes it clear that each individual must acknowledge not only otherness in all its forms but also the plurality of his or her own identity, within societies that call themselves plural. Only in this way can identity be preserved as an adaptive process and as a capacity for expression, creation, and innovation."

"This Declaration, which sets against inward-looking fundamentalism the prospect of a more open, creative, and democratic world, is now one of the founding texts of the new ethics promoted by UNESCO in the early twentieth century. My hope is that one day it may acquire the same force at the Universal Declaration of Human Rights." -- Koichiro Matsuura