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In black American culture, there is a colorist issue in which lighter-complexion black American are treated better in a positive way than those of darker complexion.
If a darker-complexion person of an ethnicity has been treated inferior by lighter-skinned peers of the same ethnicity, I can see that person lashing out more often when treated unfavorably.
Because we live in a society where people with lighter skin are thought of as more beautiful, and in some parts of the world, more capable.
I lived in Asia when I was a child and this was very, very prevalent there. If you were fair-skinned, you were thought to be more beautiful, more capable, more talented, more likely to marry and succeed. If you were dark-skinned, well, you have to try a lot harder to be seen as anywhere near approaching that level. People don't want to straight out say that "Oh, you're fair, so you're lovely. Oh, you're dark, so you're ugly." But that exists everywhere in Asia, from the neon advertising on highways to the adverts you get hit with at the movie theater.
So, imagine the plight of someone with darker skin going through all that. Having to live under all of that just because they were "unlucky" in the genetic lottery. They can't change the color of their skin. It's also impossible for them to individually change how society treats fair-skinned and dark-skinned folk differently. So, while I will never condone open bullying and harassment by anyone, I can understand - and empathize - with the frustration of having to grow up in a culture like that.