Saying that the r-word has alternate meanings doesn't mean it's less bad than the other ones! The f-slur allegedly has different original meanings. Also, if words can evolve, then by that metric, the n-word should certainly be acceptable for anyone to use, no? Pretty obvious all-or-nothing thing from my view. I honestly don't care if anyone says any of those words, but they're all sort of faux pas and rightfully so - most especially the r-word.
Yes. And though the n-word is not quite there, I think it will get there eventually. The languages change. Where would we be without Shakespeare?