After Rick Warren's son Matthew committed suicide following a long struggle with mental illness, gay marriage supporters as well as Christians opposed to Rick Warren's The Purpose Driven Life have bashed the well known megapastor.
Some of Warren's Christian critics have failed to follow the Bible which teaches us to "speak the truth in love." - Ephesians 4:15 NLT
Other biblical advice regarding disputes involves first confronting the Christian in private:
"If another believer sins against you, go privately and point out the offense. If the other person listens and confesses it, you have won that person back.
This infographic by Knowledge Train recommends acknowledging the person's strong points before confronting them with any problems and offering support to help them change. In this way the confrontation can end positively.