This is a touchy subject depending on how serious it. For example, if one player is trying to start something by racial slurs or offending subjects and no one is responding or paying attention, that 'one player' should be gagged or muted (situational) however long seems fair. But if the player starting something gets attention, and more players are responding with unnecessary and immature responses that may include harassment, racial slurs, etc. All players should be muted or gagged. They should know better than to act like that. But again, this is a very situational and touchy subject, and there can be more than one solutions and situations. It's hard to cover.