When you do the mitzva be careful not to ashame him. It says
אל תוכיח לץ פן ישנאך הוכיח חכם ויאהבך says the Shlah Hakadesh that when you admonish him, don’t say he is a letz because he will come to hate you and not accept the admonishment, but if you say he is a chacham he will come to love you and accept it.
