I think part of the reason lies at heart with culture. I was brought up with the influence of my parents, they were brought up from theirs and collectively my culture has passed down due to the location of my ancestry which is situated for the most part in Britain, whereas as I can only imagine how Japanese culture differs from others (including other Asian ethnicities) especially mine.
I have heard before amongst people that Japanese culture was unusual (in comparison to theirs), in how they view themselves as the supreme ethnicity. At the time, this to me seemed definitely racist (I will refrain from using this word now on). I now realise that just because a culture doesn't do things that are accustom to my culture, it doesn't mean they are rude are particularly in this case discriminating against others not of their own type. In the same way (although a different matter) to how I would not think it to be of any significance swearing casually with friends, it's the way I was raised. However I am sure there are a select few who would disagree that it is use of atrocious language which is fair enough. Just because we have conflicting opinions it doesn't particularly make either of us obnoxious.
As someone else explained, they (Japanese) do not view it in the sense of being rejective towards others, as it is accustom to them and part of their culture with different ways. So specifically going back to the case at hand, not allowing others outside of the Japanese culture to have a product seems absurd to me (the views of my culture) whereas this is normal for others (the views of their culture). I wouldn't like to delve any deeper though into this discussion & have uncovered the answers I was looking for. Although I cannot speak for everyone, this is what I have acknowledged about Japanese culture (at least on Suyama-San's behalf).
Again, if I do have the wrong end of the stick about this, I am not claiming it to be factual but am merely stating what I have understood.