<br /> In just 24 hours, Roseanne Barr posted a racist tweet, apologized, and left Twitter.<br />She singled out Valerie Jarrett, a black former adviser to Barack Obama.<br />Barr tweeted Jarrett was the “baby” of Egypt's Muslim Brotherhood and 'Planet of the Apes.'<br />Buzzfeed reports Barr was instantly jeered by celebs and her hit show was canceled.<br />Rita Moreno tweeted at Barr saying, “Your meanness is staggering.” <br />
