The only times you will hear this, is out of the mouths of Chinese/Korean nationalists looking to bash the country (their own bigotry), or Gaijin blogs from young white (usually affluent) kids who are/were upset they weren't treated like kings when the got off the plane. They were upset that the girls didn't throw themselves at them and that people didn't rush to attend their every whim.
If you look at actual scientific studies, you'll find Japan is on-par with the rest of the world when it comes to their racism. Japan is actually less racist than France and equal to places like Finland or Germany.
Source: https://www.washingtonpost.com/news/worldviews/wp/2013/05/15...