Man...I'm gonna say some real shyt right now.
My white friend...I've known this guy for over 20 years. We had a conversation after the bar while smoking some weed.
He was trying to say the holocaust was a bigger tragedy than slavery (they were both bad but...)
I then told him...
The holocaust lasted 4 years...slavery lasted 400.
Most people are done wth high school and in college or graduated one or the other in 4 years.
Most people won't even live to see 100 years of age.
After explaining that...as well as the fact that slavery is responsible for the majority of the wealth of the Americas and Europe...he then said...

"you're right".
Disrespect against black people is deeply ingrained in American society and culture to the point where it's accepted.