Interesting you should say that. I was a graduate student when the first "Star Wars" movies were in the theatres, going for a degree in Special Education. One of my students to whom I was an aide was a young black teen with a rather severe case of Cerebral Palsy. He loved the first movie, and couldn't wait to see the second. His mom took him to the premiere. That next Monday, I asked him about it. He was very upset! When I asked him why, all he could say, in his CP-affected speech, was "Lando Calrissian! I hate him!" I think the fact that the character betrayed Han and the group deeply hurt him - particularly the fact that Calrissian was black.
Billy Dee Williams has been asked how did he prepare for playing Lando. What in his life experiences did be bring to it. He said that it would be nothing like his life, it’s a whole other world. His role model was Errol Flynn and other pirate actors. Black has nothing to do with it.