He said Billy Bob because that's a stereotypical hick name, which archetype easily fits Billy Ray to a 't'. And now that it's been explained and you're retarded, it isn't funny anymore.
I use to like Trace Cyrus, I honestly defended him because I try to never judge celebrities based on anything except their performance. I didn't despise Metro Station (I would never call it good music but I enjoyed a song or two).
It has now gotten to the point where I see even his name and I get sick to my stomach.
It takes a lot for me to hate a celebrity, the only recent one that comes to mind is Kesha. I now have no defense left for Trace.