Is it permissible to denounce the religious innovations (bid'ah) that are prevalent at graves in a loud voice if their practitioners persist in them after being advised individually?

The questioner:
He says: Honorable Shaykh, may Allah grant you success. The questioner says: I am a man who goes to the cemetery after the 'Asr prayer with the funeral processions. Then, while I am in the cemetery, I find some wrongdoings and religious innovations (bid'ah). So I denounce the practitioners of these innovations in a gentle manner between myself and them. But some of them are stubborn and refuse to accept the truth. So I call out in a loud voice, saying: "O Muslims, and O people of the oneness of Allah (tawhid), look at this religious innovation (bid'ah)." Then I see its practitioner turn and flee. His question is: Is this action correct? Then he mentioned types of innovations, such as seeing writing on a grave, or seeing someone sprinkle water on the grave on the pretext of cooling the deceased, or seeing

The Shaykh:
meaning an old grave being sprinkled with water, and it is old and not freshly buried?

The questioner:
on the pretext of cooling the deceased.

The Shaykh:
If he is sprinkling an old grave, this is not permissible. As for sprinkling the grave at the time of burial, there is no harm in that for the purpose of settling the soil. As for his denouncing him privately between himself and him and explaining something good to him, if he persists, the obligatory thing is to report him. He should report him to the committees, the committees for enjoining good and forbidding evil, that such and such is happening in the cemetery. Then delegates from them will attend and monitor these matters.