i recently met a black guy online who wanted me to call him the N word. Honestly it was a turn on for me too, and i'm not a racist guy. he was really into it, during our chats. but he never showed up in person. i guess he got what he needed by the messaging. you are not the only one who likes this 'race play' as some call it, by any means. there's a blog on tumblr, i think, that is all about this type of stuff, full of pics of black men being degraded and pics of white supremacists.
i'm not a therapist and its not my place to analyze any of this, but so much of what turns us guys on comes from our deep seated feelings of shame, submissiveness, and sometimes even self hatred. if we can channel them in positive ways, its better than spending a fortune in a therapist's office! hey, straight people do the humiliation thing too, after all. some of it may be a hunger for masculinity. in our culture, masculinity has become attached to the 'conservative' as opposed to the 'liberal.' For many men, nothing in america says 'real man' more than than the gritty, scruffy, racist redneck. i guess 'nigger' stuff may come from that in part. who knows? as long as you don't hook up with anyone dangerous, like trying to cruise a skinhead bar, i say do it if it makes you feel good. but if there's a point when and if it begins to feel bad, then you may be ready to stop and analyze your feelings.