I've always found that one can judge MUCH by how a society treats its women. So, it's NOT surprising that Chinese women are some of the "crudest" and "worst, most dishonest storekeepers going."
It's true for FOBs (Fresh off the Boeing) and CIAs (Chinese in America) but NOT, I believe, for ABCs--American-born Chinese. Maybe I'm wrong.
These people for the most part are first or second generation out of the crude depths of peasant culture. Some are nouveau riche and have no social polish.
But these objections are trivial. Diamonds look awful without polish but are still diamonds.