Don't harass, abuse, or spam other players.
Don't scream, yell, threaten, or stalk other players.
Don't distribute, post, publish, upload, disseminate or discuss defamatory, infringing, obscene, sexual or unlawful materials like child pornography or illegal drugs, including images, audio, video, or text.
Don't post links to websites that violate the Code of Conduct.
Don't give out information that personally identifies you (such as your real name, address, phone number, credit card number, etc.) while you're playing. This includes voice chat and the names you create for your gamertag or mottos. This information could be used by other players for illegal or harmful purposes. Also, don't give out the personal information of other players.
Don't create a gamertag or motto that other users may be offended by, this includes comments that look, sound like, stand for, hint at, abbreviate, or insinuate any of the following: profane words/phrases, topics or content of a sexual nature, hate speech (including but not limited to racial, ethnic, or religious slurs), illegal drugs/controlled substances, or illegal activities.
Don't create a gamertag or motto that references controversial religious topics, notorious people, organizations, or sensitive current or historical events that may also be considered inappropriate.
WHAT TO DO:
Take a break or mute a player who makes you angry. If you act out it could be considered harassment.
Send negative feedback or file complaints on problem players. Select them from the player list and choose the Feedback or File a Complaint option.
If you find players you enjoy gaming with, put them on your preferred gamers list.
If you encounter an obnoxious player, you can mute them. Some games even allow the host to boot them from the session.
If you're a parent, you can use Family Settings to turn off your kids' ability to use the Voice Communicator and their ability to make online purchases. You can use Family Settings on Xbox 360 & Windows Vista to control who your child can play with and how much interaction they can have with the community.