I have a question.

I’m a lurker of the forum. I have a question.
Why do black people on this site bully other black people on here? I have noticed that the same people who create post about racism are the same people calling other black people here racial slurs. I do not mean calling them a racial slur in a friendly way (I know that’s how some people address their friends using slurs like the f slur and n slur) it’s obviously hostile and I just want to know why this happens. It just makes me feel sad is all.