Complete the picture together.
You have information. The other person has information.
Until you bring that information into the interaction, you are working with two separate pictures.
Disinformation often works with fragments: one frightening risk, one personal experience, one study or one dramatic claim detached from everything around it.
The reflex to correct can make us add another fragment before we even know what picture the other person is seeing.
First find out what is already there.
What has this person heard? What have they understood from it? What concerns them? What are they basing their conclusion on?
And don’t forget the other direction: What might they know that you don’t?
You do not have to agree with everything that enters the conversation.
But you cannot build shared understanding from relevant information that never enters the space between you.
What could you say that would help both of you put more of the relevant picture on the table?