Meanwhile, you were ostensibly making a level-headed argument about how there may be tradeoffs between discrimination and fairness; that to entirely eliminate discrimination we mathematically might be required to force some (say) ethnicities subsidize others. You could have made that point in any number of ways without using the words "deadbeat blacks" --- as I pointed out, the same point was available to you in a comparison between whites and Asians.
As you can see from the thread, the objection wasn't to the underlying point you were trying to make, but to the way you chose to make it. Simply put: a reasonable reader could come to the conclusion that you were not only trying to make a point about a tension between non-discrimination and fairness/accuracy, but also trying to use that argument as a device to smuggle in an ethnic slur.
I don't think you're a racist, by the way. I think something else is going on with you. Maybe I'm wrong. But as you are to statistics, I am to the oeuvre of 'yummyfajitas comments on Hacker News: they are an area of my expertise.