Different ethnic groups have different positive and negative attributes. If there can be positive there can be negative.   There  can be ones that are very hard working.  But also cheap.    Personally from experience hate to be in line behind a Chinese person. They seem to watch the scanner like a hawk and will take the cashier to task over the smallest amount that they feel they are being over charged.  I am cheap but as a WASP I am somewhat conflict averse so would n't make a big deal over a slight overpayment.