Here Ya Go
This not only derails the discussion but also tries to turn the insults/race issues into the fault of POC and their tone. Many POC have come to the realization that the expectation of politeness when saying something insulting is a form of privilege.
This scenerio plays out in debates about feminism as well. Smile and be nice, ladies and POC. Prove to the people with privilege why you should be treated as their equals. 
