i just saw this on the xbox forums...

(Kid who got banned)- 'You ban me for being blue... If someone made their avatar black you wouldn't ban them. Why are you all hating on the smurfs?'

Xbox product team member- In 1963, a French comic called Les Schtroumpfs Noirs was first released to the public. This comic featured a storyline wherein one Smurf was turned, interestingly enough, pitch black after being stung by a black fly (though the colour was changed to purple for the cartoon). This infected Smurf then is reverted to a single line of vocabulary, has stunted movement and sought to bite other Smurfs upon their tails. The bite of an infected Smurf quickly causes the victim to become one of them, and soon a horde of these black Smurfs rapidly overrun the populace. This story is considered by some to be the Ur Example of modern zombie fiction, and may have inspired notable figures as George Romero in the creation of the undead menace that grips us so well today.

As you can see, Smurfs are exceptionally dangerous. It is through them that the zombie apocalypse will come, and it is our duty to keep humanity safe against the undead horde. Be they blue, black, purple, yellow (whom we assume to be jaundiced) or green (sick), we prevent the Smurfs from potentially causing the end of humankind by immediately removing them from the service as we see them. Only through our diligence can we hold back the inevitable tide, and we here at the Xbox LIVE Policy and Enforcement Team take our duty seriously.