The Earth isn't flat. Birds are living, breathing animals. The Matterhorn stands 4,478 meters tall. These things aren't debatable...yet, they are.
Facts are backed by science, proven outcomes through trial and error. They can't be proven false. Yet, they're regularly disputed...irrational for most, but not for those who believe differently.
We all have stories in our head. And, they're different for each of us. They must be. We're all unique. No two people have exactly the same world view, exactly the same belief system, had exactly the same parents, teachers and friends. No two people have exactly the same outlook about everything. All of us have different dreams and desires.
The key to changing anyone is to first seek to understand the framework of their world view. How do they define real? And, then to understand how it feels to be wrong. Sometimes, it's better to find someone else to change.