I don't agree that all non-Japanese are perceived or treated equally. In particular, some people harbour prejudices against Koreans and Chinese people. It's not common, but I know from Korean friends that they can meet with some unpleasantness that a European would never encounter. (The same is true for Japanese people in Korea and China). And people from "developing" countries don't get the rock star treatment as much as people from "advanced" countries. These are not things that are easy to notice, but they are there.

I think the perception of Indian men in Japan may be rather positive compared with other "brown" people because a number of Indians in Japan are rather eliite technology sector workers. Japan's mass media also seems to be quite taken with a narrative about the high standard of Indian schools - both in India and in Japan. I think that many Japanese people have the impression that Indians tend to be well educated.