Would Usher be offended if I....?

Umm, this is random but, I was reading Justin Bieber: First Step 2 Forever: My Story, and I saw Usher, so then I thought....since I say it with my friends, if Usher would be offended if I called him a ni gg er? Like: "Wassup, n i g g a h!!!!!!" Friendly way. Know what I'm sayin? :D