“And one is not permitted to give mussar to people who will not be influenced by it.”
I am not commenting on this specific topic, but the Orchos Tzadikim (Sha’ar Hachanifus) says: ????? ?? ???? ????? ?? ??? ???? ????? ???? ???? ?? ?????? ?? ?????? ??? ?? ??? ???? ???????? ?? ?? ??? ?????? ??? ?? ?? ???? ?????? ??????? ???? ????? ??? ?? ????? ?????? ?????? ?????? ??????
Granted he concludes by saying ??? ?? ???? ???? ????? ??? ????? ????? ?? ????? ???? ???? ??? ???? ???????? ?? ?? ???? ?? ???? ?? ?? ????? ????? ??? ????? ???? ??? ????? ?? ???? ??? ???? ??? ????? ???? ????? ???? ????? ?????? ??? ???? ??????
So there is a very fine line that needs to be traversed in any of these types of situations.