Because some of us, like myself, grew up using those words as insults. I would never consciously use them now to put down someone else because I know it's just a hateful word. But there have absolutely been times in the past 5-10 years where if I got really angry at something, my brain just starts dumping out words and sometimes those sneak in there. It's not like I stop and think of the best combination of bad words, shit just comes out. So to me, when I see people jump all over Deadmau5, calling him a racist and bashing his music, I see it as an overreaction. Because I've done it and I know who I am and where I stand. People say really stupid things when their angry.