What unadulterated crap this is.  I know plenty of Koreans (and Chinese, Vietnamese, etc.) who were born right here in the US of A.  They grew up as I did, played the same video games, ate mostly the same food, celebrated (mostly) the same holidays and attended the same schools.  Many don't know enough of their "native" language to order fluently in an "ethnic" restaurant.  The idea that one's "race" must be accompanied by some stereotypical cultural heritage is absurd.  And, finally, if someone isn't up to introducing a youngster to kimchee and how to use chopsticks, parenting in general is probably waaaaay beyond their abilities.

Another makes the same basic point but draws from personal experience: