Forum:Ruling question

So watching a duel at school today a guy, during his oppnets turn, would set his hand aside and pick up the spell/trap cards he set and hold them in his hands. I have never seen this done and he gave me the "IM a judge its legal long as I say I am doing it" which he never did just keep doing it to his oponet. So is this legal? If he does not say he is doing it every turn, if this is legal, can he be disqualified?