googling bill maher to find out what he said that everyone was freaking out about, I found an article talking about another time on his show when he told someone he wouldn't have known they were black if they hadn't told him. and the person writing the article thought this was super offensive. Why? Race isn't self-determined. If she looks white, she's white. That's all race is. Isn't it? It's not "real", it's just what other people perceive you as.
also i don't see what harm the "house nigger" thing causes except: some people are triggered by the word, and that's legitimate, they're not just whiny babies or whatever, but people can be triggered by anything. What kind of harmful idea did he perpetuate by saying that? Maybe it made people think that slavery isn't so bad, as long as it's inside because then it's not as strenuous, and people are still being kept in slavery today, maybe it helps continue that, but that's not a race thing.