If a White person or several White people buy up a lot of xbox's or play stations on launch day only to resell them on Craigslist or ebay, I don't here anyone say, look at what those White people are doing. I also don't read on any forums where White people are embarrassed that other White people are doing something wrong. If they the are White, and scalpers, then people will be mad at them for being scalpers.
However, when it is the other groups engaging in scalping or other behavior viewed as incorrect, whether you directly mention their race, ethnicity, country of origin or not, the discussion evolves around not only assessing the behavior such as scalping, but generally now we are looking at the entire group they come from and making some analysis of "those" people. Why would an Asian person be embarrassed for Asian people, even if he disagrees with scalping? Are whites embarrassed when a white person walks in a mall and starts shooting everyone because the shooter is White? No, and they shouldn't be.
People, regardless of skin color, culture, ethnicity, country of origin, etc can do some pretty remarkable and some very disgusting things as well. It is the spectrum of human behavior.
As of last year, 77% of this country is white. That means it is in our nature to be wary of outsiders and blame them for our ills. That's the way the cookie crumbles.