A button on right click that says "Report for RMT." 8 or more reports from players mutes the account. Doesn't ban it, just stops it from shouting or sending tells for 24 hours until they can contact a GM if they are a legit player. 16 or more reports locks it down and prevents it from teleporting or taking any actions. If the reporters abused the function to harass someone, the GM gets the option to mass suspend them pending further investigation as well.