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I think the massive lack of education regarding race and other ethnicity leading to ignorance and a v sheltered/racist view of darker skinned people weather from africa or south Asia. Its changing but very slowly with china links with African countries and more Africans working and living in china esp in south china. But only a few years a go at a televised state gala one performance included full blackface.
Even here in HK people from south asia/india/africa will be looked down by some older generations simply because of skin color enhanced by English colonial past no doubt.
why is that ,why do the Chinese have a particular issue with African appearing in adverts ?