If he continues then just remove him from whatever situation you are in at the time and let him know when he acts how you have asked him to, then he can rejoin everyone else.
nikipafanya tukipafanya ukipafanya mkipafanya akipafanya wakipafanya ukipafanya ikipafanya likipafanya yakipafanya kikipafanya vikipafanya ikipafanya zikipafanya ukipafanya kukipafanya pakipafanya mukipafanya