Why is this true about...........?

Why do black people think everythings racist aganist them ? As I have studied them, socialized with them, made friends with them, they tend to be the harshes critics aganist every race. They trash talk white people, asians, mexicans, and other races. Most are very racist, yet they go ape sh*t when someone calls them racist and then fireworks blow up with colorful language. I mean oher ethnicities know when they're racists.....