I don't get what point you're trying to make. Anyway, the point is that there are NOT three main racial groups, which is what you mentioned earlier and why you're getting downvoted so much.
My point, appearance wise humans differ when it comes to race. Certain traits are more prevalent in one race over the other. White people typically have lighter skin because again, Europe is a cold environment. Black people typically have darker skin tones.Why? Because Africa is a hot environment?
Appearance wise, in the face, there are small differences in each race...Why are you denying this? Asians do usually "look" a certain way. Im just saying we look a little different and I just used this to separate humanity into different races and that's truee. You're not being racist by saying this.
"Also as someone who grew up in a black majority society with a white and Asian minority, we didn't have racial crimes because we don't have racist views towards any race, not because the society is homogeneous"
This is called an anecdote. Only 1.5% of the Japanese population is composed of foreigners. https://www.japantimes.co.jp/news/2013/08/29/national/foreigners-make-up-1-5-of-populace/
Racial hate crimes typically don't take place in Japan because why would a Japanese person commit a crime against another Japanese person for being Japanese? It doesn't work like that. When you mix different cultures and different lines of thinking with people, you create more diversity but as a result, that reflects on people. This can have a negative effect in a society. I repeat it "can" have a negative effect but not always.
You see how with the US there are plenty of sources on racial hate crimes for the US but not for Japan?