“Brothers and sisters, if someone is caught in a sin, you who live by the Spirit should restore that person gently.” (Galatians 6:1a)
As Christians we want to challenge one another to become more Christ like, but if we try to push someone to change too quickly or too aggressively, then they may not be able to cope and just leave the church or give up on faith. That is why the verse above says, that when someone is caught in a sin, we need to go about restoring them gently.