"Why would you ruin perfectly good peanuts by adding candy corn? That's like saying hey, I have these awesome nachos, guess I better add some dryer lint." - Nonny
At the risk of being flamed, I do have an honest and sincere question. At what point does something move past any racist/un-PC connotations and just become part of the collective? If no one had posted about Camptown Races being racist, I'd never know. I think if you asked 100 people what it's about, the majority wouldn't know what it's about either. Does pointing it out make a difference? Will it really change anything? Is anyone honestly offended by it? (No snark here, really)
It makes a difference when you don't know that 'Wetback' is a slur and go on to public office, and use it in a sentence, on camera, in the midst of a huge national debate on immigration, entitlements and job reforms. It's not just embarrassing that the person neither realized or had it pointed out that is was a slur - but it also shows an outstanding lack of insight and awareness. On a subject they are required to be much more informed.
It doesn't matter much if my MIL called a woman 'Oriental' last month. But when I gently told her to say 'Asian' and why, there was some education. So, pointing it out made a little difference.