To say that a monk is evil is more guilty than gouging out the eyes of the whole world. Those who tell the truth about their families will go to hell.
Even if the other person is not a monk, you should not expose others' shortcomings behind their backs. On the one hand, it will ruin each other's reputation, on the other hand, it will also ruin your own mind and bodhicitta. Even if you see someone else's fault, you can't say it. This is very immoral!
If you want to learn Buddhism, you must be soft-hearted, follow the path of Bodhisattva, do ten good things, don't be abusive, and don't alienate your relatives and friends. If you want to become a Buddha, you must first eliminate selfishness and opinions.