Roseanne Barr was fired because she posted a series of racist tweets, including one comparing former Obama advisor Valerie Jarrett to the "Muslim Brotherhood & Planet of the Apes." This tweet sparked immediate outrage and led ABC to cancel the highly successful reboot of her sitcom "Roseanne" in May 2018. ABC called her comments "abhorrent, repugnant, and inconsistent with our values," and despite Barr's apology, the network decided to terminate the show to maintain its standards and values.