As someone of Korean descent, I found the WaPo article referenced by this Crooked Timber thread especially disturbing.
My take: The poor guy works his ass off embroidering t-shirts in his basement, and provides service superior to all his competitors, so that the retail business owners can sell them for 200%+ markup to communities that, let's face it, could stand to do more productive things with their capital. Who's being exploited here? Then when Kang decides to go into business for himself, trimming the fat that these middlemen are skimming off his production, they paper the town with flyers that basically warn of the Great Yellow Threat. To the extent that these business owners aren't slammed for the scum they are, this is a case of white liberal guilt giving blacks a free pass for behavior that they'd never tolerate from anybody else.
BTW, the only times in my life that I've been racially insulted by a stranger in public have been on the street in New York City, and the strangers were always black.
Full disclaimer: yes, the Korean and Korean-American communities have their own considerable racism problems to deal with. Additionally, I personally find the (New York-area) Korean-American community to be materialistic, status-conscious, reflexively pious, politically disengaged (and even reactionary), and obsessed with preserving "face" and politeness instead of honesty. But they don't put up posters of red-lipped little Sambo eating watermelon.