Rude treatment in Japan for Asian tourists: Noticing a pattern

I saw this thread on the solotravel sub about a girl complaining about how a bus driver slapped her hand really hard in Kyoto because she made a mistake while paying. I was then curious about her background since I myself had several bad encounters in Japan. Nothing too serious, but it leaves a bad taste in your mouth type of situations. I then looked through the profiles of other commenters talking about their bad experiences, and literally every single one of them was either Asian or southeast Asian diaspora in the West (I used the keyword "Asian" on their profiles)...