I wouldn't call it racism, either. Recognizing that different cultures and peoples are different isn't racism, and I wouldn't ever expect people to treat me as a Japanese, because I'm not one. That doesn't mean I'm not treated as an equal, it just means I'm not treated as the same (as I'm obviously not).

I'm thinking of writing a blog post or something about this in a positive light, since most of what you read about Japan in English is from the perspective of people who have a bone to pick with their experience. There's positives and negatives of being an integrated minority in what is by some definitions an ethnostate. I might even say there's some "minority privilege," depending on the situation.