Because "afro" was a hair style worn by primarily black people a few decades ago when racial tensions were higher. It's an old term and as such is considered t

Because "afro" was a hair style worn by primarily black people a few decades ago when racial tensions were higher. It's an old term and as such is considered to be used by people who don't care enough to adopt more modern language to refer to people of the race and their culture. In this case, it's the title of a real show and the protagonist is very respectfully portrayed in the anime. Recommended.