As a white American that spent two years in Japan, this did happen to me.  Numerous times.  And I was not drinking, being loud, or dressed inappropriately.  I have no showing tattoos, and I was being respectful.  A few friends and I went to see the Hiroshima dome and were denied entrance into two bars and one restaurant for being white.  Don't call shenanigans on things just because you haven't experienced them.  I experienced the same thing in Naha, Okinawa.