In depends on how you look at it.
Are you familiar with the "glass half empty", "glass half full" expression?
Japanese people are human beings; they have different personalities and different thoughts.
I haven't been to Japan in a while, nor am I African, but this issue can be solved with common sense.
Let's be real: There will always be someone who will disagree and/or dislike you; it's human nature.
However, which group deserves your attention most? The group that thinks
negatively of you or the group that thinks
positively of you?
In fact, there's an African celebrity over there known as ボービ, and he's pretty dark.
Though, I don't know much about him, he seemed fairly well accepted.
Here is part of an episode of a show where various celebrities participate in different games. [Note the game where they have to walk through a crowded mall without being recognized]
Click here
Also, take a look (this isn't Bob): [This is a popular game where you must endure various forms of torture while trying to remain silent]