You must avoid interacting with people who come to you with a vengeance. They are troubled by their failures, sadness, or pain. We should empathize with them but not entertain them.
The reason for not entertaining them is simple. They are mentally unstable. They are in delusion because of their pain. Even though they don’t mean anything bad on the face, the brain will bring back the vengeance, and anger will turn them into monsters.
All they can talk about is their greatness. It is well-researched when someone is not in the right senses. All they have is a delusion.