One of the "friends" that i have on xbox live changed his gamertag to purposely offend my friend and his girlfriend by changing his gamertag to [Mod Removed] to make fun of his and her relationship. Now his girlfriend thinks that he has been telling people that they are doing things they aren't and she has completely blocked communications with everyone and will not answer her phone when he or anyone else calls her. The "friend" has also threatened to change his name to something even worse about the two of them. This is against the code of conduct for xbox live and can and should result in a ban on his xbox.
Mod Edit: Please do not name and shame on the forums. Thank you.