Remember, these features are always available:

Ignore

If you're being bothered by another player, you can choose to block their chat. To ignore a player, double-click their name in the list of players. A new window will open showing information about this player. At the bottom of the window is a checkbox labeled "Ignore." Check this box and you'll no longer receive chat messages from that player -- instant messages or general chat.

Profanity Filter

You now have the ability to control what language you do and do not see in the game rooms. If you choose to use the filter, profane words will be replaced with an "@" symbol in the chat area. To enable this feature, go into a game lobby and click "Options." Under the heading "Profanity Filter," you can choose the strength of the filter -- none, weak, or strong. "None" means no profanity filter. "Weak" catches common profane words. "Strong" also catches clever use of dashes and underscores between letters that would normally be missed by a filter.

Ignore Invitations

If you're getting too many invitations to join a room, you can choose to turn off this option. In a game lobby, click "Options" and then check the box next to "Decline All Invitations."