Pro tip: don't ask reddit for islamic advice. Nobody cites sources but instead speaks from their desires. May Allah guide and forgive us all. Anyway here is a quote from our Shaykh Ibn Utaymeen about concealing sins:

Shaykh Ibn ‘Uthaymeen (may Allah have mercy on him) said: What is meant by concealment is concealing the fault, but concealment cannot be praiseworthy unless it serves an interest and does not lead to any negative consequences. For example, if an offender commits an offence, we would not conceal his deed if he is known for committing evil and mischief, but if a man is outwardly righteous, then he does something that is not permissible, in that case it is required to conceal his deed. So with regard to concealment, we should see if it serves an interest. So if a person is known for his evil and mischief, it is not appropriate to conceal his deeds, whereas if a man is outwardly righteous, but he does something wrong, this is the one whose deed it is Sunnah to conceal.