See my upload on the topic Joan references.
Joan Rivers
When A Joke Was a Joke! (Joan Rivers vs Don Rickles)
From Radar Online we have this (I combined this with Big governments post of the video that follows the Joan Rivers news):
Comedienne Joan Rivers revealed she once ditched a joke about First Lady Michelle Obama from her stand-up routine – because she feared she’d be accused of racism.
Recalling the wisecrack to shock Jock Howard Stern, the comedy legend said: “We used to have Jackie O now we have Blackie O!”