How do I talk to people who are "wrong"? Don't burn me yet

[faraway]

I thought the FL9s......
That's interesting.. I was told that the FL9s.................
OK... I heard that the FL9's were........
Neat!! But I was told years ago, the FL9s were.............

That is the way I do it too. It is fine iIf the other one takes the invitation to an open discussion. Otherwise do I stop and shut up.