No, the burden of proof is on those making the claim.That's absurd. This is not a scientific forum, it's a hobby forum. No one here owes you anything.
Regardless, your claim is silly, because not all assertions are equal. If I tell you the earth is round, I don't need to prove to you that it's not flat. If you think it's flat, that's purely your problem, not mine.
Several experts that I know have told me that the earth isn't really round, but rather pear-shaped. I didn't insist that they "prove" it.

