You clearly have not seen many minstrel shows. It was often black people in black face so stale chocolate is both tasty and historically accurate.
See http://www.amazon.com/Blacks-Blackface-Sourcebook-Musical-VOLUME/dp/0810883503 for a study of black people in black face
There’s not much difference between drag and blackface minstrelsy.
Drag relies on stereotypes of women blown out of proportion. There are some female performers, and some women enjoy watching it as well.
Most people don’t realize that black face minstrelsy was also very popular with black people. There were black performers (who wore even darker black face) and performed in black-only clubs and parlors.
Basically, things can be super common,accepted, funny and entertaining, and not be politically correct (or even morally right).
I realize this post is a little out there so here are some sources:
https://www.amazon.com/Blacks-Blackface-Sourcebook-Early-Musical/dp/0810883503
(Bert Williams is an interesting historical figure. At the time, he was the highest paid black actor and the first international superstar. Upon his death the black community disowned him for his blackface performances because they had fallen out of fashion, but at the height of his career many black audiences adored him.)