There is definitely some serious discrimination in Japan but I wouldn't call it racism. A lot of it is built out of Japanese are far superior to everyone around them but its also built a lot out of the force occupation of Japan after ww2? Like the rental thing is based of when Americans first vcame ver after the war they were loud noisy smelly messy you normal American solider and refused to do antpything to help coexistants easier. So we still have that reputation and Japanese don't want to live around us because of that and thus gaijin houses. There is definitely discrimination for sure espically in rural areas but I mean realistically if Japanese can have a Japanese renter or a Japanese customer or worker the white person is the next one on the list of acceptable about other Asians and espically above blacks and southeast Asians so I can't really call it racism