It's interesting to me that you made this connection. Because my first thought, when I read Xeni's snark at the end of the post ("Welcome to post-racial America!") was how similar it is to hearing some jackass say "So much for Global Warming" during a snowstorm.
The implication of her "Welcome to post-racial America!" parting shot is that this incident is indicative of an across-the-board attitude (in Memphis, or in Tennessee, or in "America!") It's not. And no reasonable, discerning person would think otherwise. We're all shocked by these whites-only waterfountain and lynching comments because they're shocking. If they weren't shocking to us, then there might be some validity to the "Welcome to post-racial America!" jibe. If they weren't being reported on the news, as shocking, then we'd have a problem.
There will never be a "post-racial" America, or anything: there will always be someone making stupid, insenstive comments somewhere, sometime. If we're going to hear one idiot make a racist remark and decide that "AHA!!! America is still a racist country!!!" based on it, then there's no hope at all. I doubt it's the case, but what if it turns out the offender in this situation is either mentally ill, or someone in the throws of elderly dementia? Would this still be seen as "typical" "status quo" racism in America?
Seriously. Implying that this admittedly effed up situation is "business as usual" in Memphis, or America, is disingenuous. Having lived in Memphis for a good portion of my life (and many other places besides) I can tell you that almost no one in Memphis would think that casually speaking of segregated water fountains, lynching, etc, in the manner that it appears (from the recording in question) is acceptable, normal, whatever.
And speaking of disingenuous (off-topic) I find it really interesting that no editor at boingboing.net has posted about the Wisconsin "Slender Man" story. One of the biggest and most contentious threads recently was the Santa Barbara shooting, but the "Slender Man" story (which is much more topical, from a Internet-community standpoint) is being ignored here. But hey, let's just talk about that cranky Cracker in Memphis instead!