Many say that you can’t judge the actions of others. But if someone is committing sin, it is charitable to correct them (certainly at the proper time, out of charity and love, and within your state in life), as Father Isaac Mary Relyea says in his first podcast (he is speaking here about people in sinful relationships):
“Correct these people, out of charity. If you love someone you will the highest good for them – that they get to Heaven. And if you love someone therefore you want them to get to Heaven, you’re not going to lead them into sin and you’re not going to condone their sins.”