Arrive in Korea and insist they're an oppressed minority and discover prejudice, bigotry, exaggeration, hatred, and inequality everywhere around them. Fucking Korea!
Then, they start blogging about how bad Korea is: they post on ESL forums; they post on expat forums. The time spent is Korea becomes an examination of popular culture and media--the way Koreans see and represent foreigners. When you search for theses authors on the google, you will learn that their activism only developed after they arrived in Korea. And the ones who've left, well, they stopped their vital work informing against hate and oppression as soon as they got home.
White Power Douchebaggery, even in Korea. This shit is what I call the privilege of being able to leave minority status behind enables and emboldens thousands of privileged white mother-fuckers to speak out against non-white haters. It's Safe Activism: thousands of white people each year finding a place, like Korea, to displace their own privilege and to project their own guilt and shame.