*** REPOSTED IN THE 4 PLAYER CHESS GROUP ***
In FFA (Free-for-All) games you can choose to deactivate chat for everyone by typing "/stop-chat".
However, in Team games, there doesn't appear to be the same option. I believe there should be an option to disable chat in Team games only between you and your opponents, but still be able to communicate with your partner.
I have played closed to 300 Team games and have noticed the occasional opponent that chooses to use derogatory language to insult either myself, my opponent, or in some cases both of us, without any provocation or justification.
The average player(s) I've played against in Team games either doesn't talk in "all chat" or has been quite cordial, congratulating their opponent(s) after the game, regardless if they won or lost the match.
As with Live Chess and other such formats of games on this site, I do believe it would be a welcomed feature if it was implemented.