He's stating indirectly that anyone who does not conform to or the 'correct' culture is uncivilized.
As xenophobia goes, I don't recall reading anything more profound than that.
And as stated, I believe that that goes for Japan, Nigeria, or Jamaica as much as it does here, which is just case in point that White Supremacy has nothing to do with it.
The stereotypical gawky German or American Tourist, screeching their native language at full volume while stomping all over foreign countries cultural institutions is horrifying to me, because when you are their country, you play by their rules and if you are in their country and don't speak their language, you better play humble as a motherfucker and apologize an awful LOT, because YOU are the fucking barbarian.
It is not about any racial anything. It is about recognizing the cultural standards in a given society and respecting those who have established and maintain them while on their turf.
I will only bring good socks to Japan, because I know I will have to take my shoes off in some weird ass places and i Sure as shit don't want to be the lumbering gaijin who couldn't at least at TRY to act right.
But your statement went so far beyond just xenophobia. You stated that there was a 'correct' culture for immigrants to conform to, and that until then, you did not consider them to be civilized.
There is and it has nothing to do with Race or racial superiority. It has to do with maintaining respect for the dominant cultural norms in a given Country. If you fuck with that, expect to be rolled over, you deserve it.