You don't. Which is why I was very careful not to say what you seem to think I said. You may want to go back and read more carefully what I actually said.
I don't know what you're an expert on, Grassy, but it's a pretty good bet you know more than I do about something. If that subject were to come up and you were to demonstrate that you are particularly knowledgeable about it, I would hope to have the wisdom and maturity to learn from you rather than carping about your knowing more than I do. Everyone's entitled to his own opinion; nobody's entitled to his own facts.