This was an honest request for information that you've somehow pattern-matched as logical rudeness.

I maintain the grandparent, with particular emphasis on the plausibility of finding the kind of evidence that demonstrates the negation of the kind of claim in question. It isn't something I would expect to find a detailed analysis of lying around and so lack of observations of the claimed thing is all that can be expected---and is already implied by denying the claim.

"Disagreement among users or communities" was all I meant by "self-contradictory."

That matches my observations. Violent agreement.