"It?s like touching a tar baby ..."
I'm sure I do. But if there are any that I used to use that could be misconstrued as being racist, I certainly would not, especially in the presence of none offensive alternatives, or just speaking plainly.
For example, I would never use the word "niggardly" when I could just as easily say "stingy" or "thrifty." Niggardly is a word that I did not hear until I was 26 years old, and upon hearing it and learning what it meant, it was obvious to me why no one used it.
However, I do think it is ridiculous that people would be offended by the use of the term Black Hole, or even Black Out, in terms of power outages.