Racist Guests

I never know what to do with racist guests.  In any other situation, if someone started telling me the difference between prairie n*****s, sand n*****s, and regular n*****s, I would call him (I find it's always a dude, for some reason) an asshole and walk away.  But when I'm in a customer service role, I can't really start calling my guests assholes.  I usually end up laughing nervously and waiting for him to go to his room.  The worst offender - the one with the N-word classifications - was a regular a few years back.  He was planning on moving to Lethbridge, and he asked me to help him move.  I was terrified of this man, so I said yes.  Thankfully, before the day came for him to move, I moved instead.  (This was when I took the brief time-out for working at motels to unsuccessfully pursue a real career.)