[yifanlu]

I have lived in America for a long time and can speak English fluently. However if I say "Americans are stupid, and most people don't know how to speak their own languages properly." even though it may be based on my observation living here for over a decade, it is ignorant at best and racist at average. I'm showing my feeling or superiority when in fact I'm the stupid one because I don't understand regionism and slang.

But that's besides the point. Just because you lived there and learned the culture (who's to say how well) doesn't mean you can't be racist against them. Otherwise, there's a lot of colonists who we own an apology to.

I've read the author's bio on their site and even there it downplays Japan and Japanese culture and up plays the author themselves.