From the story here:
At both the bank and the phone company, Adams has said, his professional advancement was thwarted by diversity hires. “There was no hope for another generic white male to get promoted any time soon,” he wrote in Dilbert 2.0: 20 Years of Dilbert. (Later in the book, he noted that his Dilbert TV show was canceled after “the network made a strategic decision to focus on shows with African-American actors.”)