[quote=@The Bork Lazer]There have been examples of AFrican-American singers and flappers in the 1940s. However, most of those singers performed in Europe. It would be especially hard to see the justification for an African-American singer in America, especially in the South where they're more harshly treated. 

However, as long as the justification for your character seems novel, it would be completely fine. 
[/quote]
I do not believe that was their question. They were wondering if their [white] flapper would be racist and so forth.