I claim there is a tea pot in orbit around the sun. I can’t sustain my claims by bringing a link, you need to provide reference to prove that I am wrong.
If you made the claim then the burden of proof is on you. The thing I was talking about is that I can automatically win the fight by asking you to provide a link.
Edit to add: a link that I know for sure you won't be able (or will be very difficult for you) to provide.
While difficult for me to characterize, I feel that there is a middle ground for more casual interactions that doesn't call for maximum rigor so as to fend off the most radical claims. In practice, we can just dismiss them without engaging.