https://en.wikipedia.org/wiki/Two_wrongs_make_a_right
You're twisting everything without seeing the bigger picture of why a few or maybe a good portion of black people turn off a lot of other people. It's not just white people who are extremely annoyed by the rap/hip pop garbage personas. Loud music, loud voices, insults to innocent people, drugs, gun shootings and the list goes on. You get what you give.
https://www.quora.com/Why-do-some-people-hate-rap-music
Injustice? Verbal abuse on a consistent basis is a lot worse than physical abuse. Black people are much less likely to be taken seriously because of the rude behavior/rap persona of a few. I feel sorry for a good portion of young blacks who get brainwashed by the rap/hip hop music and then go on towards causing psychological issues towards society.
A few bad apples spoils the bunch.
Hopefully understanding how we feel will help you see that a lot of people have an aversion towards those who stress them out.