Be as racist and bigoted as you want to any color other than black. We can bomb the shit out of brown, use Agent Orange on yellow, whatever. Killed millions? It's coo. Your Asian and European friends that live here won't mind if you use a slur as a joke, if you can take one right back.
Enslaved blacks, as was common practice for the times?
Can't use the word black in any context without dirty looks.
Not getting into the rest of the debating in this thread because lolpolitics, just wanted to chime in with something slightly irrelevant. If you hear someone use "white guilt," don't handwave it as a right/left thing - it's a pretty complicated deal.