You're missing the point. It's not a one time thing. Evidence existed, that evidence was found, and that's what made it change to being accepted.
That evidence still exists, so if you claim dinosaurs don't exist, we can just point to the evidence that still exists. That evidence didn't get spirited away like golden plates to heaven. We're still finding dinosaur bones.
If you claim dinosaurs don't exist, I would point to the wealth of evidence that they do. If you were raised in some religious cult that never taught anything about dinosaurs and taught that the Earth was 6000 years old, and therefore didn't think giant creatures existed hundreds of millions of years ago, it would absolutely be on the person claiming they exist to show you dinosaur bones. Which is evidence.
Your premise is incorrect. The burden of proof for quantum mechanics is on the people claiming they exist. They provided those proofs, which is why people believe in them. I haven't studied quantum mechanics, but if you asked somebody who does, they could offer proof or evidence. And if they couldn't, then your claim it doesn't exist (until proof was proffered) would be correct.
I've had to have several conversations with my wife about her not using a bad mental autofill.
So much of the time (especially with important conversations), she's already decided what I'm saying within the first few words (of an entire conversation) and then the conversation gets way too long because it is very clear she's not getting what I'm saying because she's locked into her autofill. She's gotten better over time, but man is it frustrating.