It is simple. I do not deal with them.
If someone says something that seems reasonable, I respond. Sometimes even have back-to-back conversations.
If someone says something that is not true, I simply have fun. By not responding most of the times :)
Win-win.
The truth is, if you truly know yourself, no one can touch you. If you are at peace with who you are, external chaos is merely a chatter. If you are aware of your qualities as well as disadvantages, you have an unfair advantage that most people don’t have. And that’s the most powerful thing.
Never forget what you are. The rest of the world will not. Wear it like armor, and it can never be used to hiurt you. — Tyrion Lannister – Game of Thrones.