I'm not arguing for the right to use racist language! I've opposed racism all my life. What we're talking about here, primarily, is the use of words that have become something different to what they were when the songs were written. Words that once would scarcely have raised an eyebrow have now attained the huge potential to cause offence. Maybe they should have raised an eyebrow, but the fact that they didn't is why they're in those songs. "Of their time," etc., is a feeble excuse; "should have known better" fits the bill more. You have three choices: don't sing the song; sing the original, unexpurgated version; change the offending words into something more anodyne. The last choice often yields ludicrous results, especially for those who know the original. Paul Robeson sang "coon" whereas many who sang the song later sang "food" instead, which is what you'll find if you look for the lyrics, which I find risible. Paul was a great humanitarian who fought for equal rights and who suffered for his fight. Maybe he was "of his time" and "should have known better". But I won't turn off his version. My Elvis car compilation has a song that characterises his gal as a good luck charm hanging off his arm. There are plenty of sixties pop songs that contain that kind of offensiveness. I suppose we could get RSI of the finger via overuse of the skip button.