HAHAHAHAHAHA
That was the most incredibly hilarious thing I've ever read. I think it's that Koreans aren't AWARE that those are necessarily derrogatory words. Their text-books still (STILL, even though they're 2007 editions) use the word "Indian" for Native Americans...so I wouldn't doubt if they also use Nigger and whatnot. They're just not culturally sensitive to anywhere but their own country. They also call themselves by "gook" (including my co-teacher, who knows it's considered derrogatory, but just doesn't care that his email is gookone@*** ).
I think the real cultural oddity is US. US, who decide "oh, this word is bad, we'll invent a new one" every few years for every visible minority grouping. The rest of the world just can't keep up, or finds such it a rediculous notion to update political-correct-ness of words regularily. And really, it IS kinda retarded. THey also still use the word retard. And they don't see anything wrong with that. They were never taught it as a bad word, so it's not. So why are we so offended? Just laugh it up and be like "Uhh, next time, say blah-blah instead"

As for the extra hole... TOTALLY more evolved! Think about it...
(Hahhahaa, I have NO idea what he meant, but something makes me wonder if that translates into normalness in Korean...maybe it's like reference to some cultural metaphor or something).