No. This isn't about extraordinary evidence, it's about the lack of ANY EVIDENCE of spirits.
To be fair,
@Calderaro seems to have been told by at least
some people that he needs extraordinary evidence. And anecdotes are indeed a
kind of evidence, one very commonly accepted in courts.
Philosophy discussions that have taken place after Sagan dropped the "extraordinary evidence" nugget have refined how skeptics should properly use it. Simply hurling it into a discussion as a knee-jerk salvo is not good skeptical practice. Avoiding the newly-minted Extraordinary Evidence Fallacy means that the standard of proof imposed on a proposition should not be amplified according to any tenet beyond evidentiary sufficiency, and especially not according to an ideological predisposition.
However, a standard of proof can still include
prima facie or
a priori factors as long as they do not reduce trivially to mere ideology. There is nothing objectionable about spiritism (in the abstract) from a
prima facie standpoint, although many specific claims in spiritism would be suspect. What justifies heightened skepticism for spiritism is
a priori reasoning. When evaluating a new claim in spiritism, is it not irrational to consider that prior spiritist claims have been the product of proven fakery, have arisen from known techniques such as cold reading, and have been supported allegedly according to science by questionable methods. This allow us to properly apply the Sagan aphorism and demand a standard of proof consistent with
a priori knowledge. But even this comes under scrutiny because it's generally desirable to treat each case purely in isolation.
Lay witness testimony in court is anecdotal. Hence to say that anecdotal evidence is categorically worthless is wrong. To say that skeptics reject it categorically is a straw man. As in court, a skeptical approach to an anecdote requires us to be able to question the witness and ascertain the reliability of the observation attested to. In many cases involving fringe claims, the witnesses are inaccessible; we must rely entirely on a limited preserved record. And most importably, as in court, a lay witness's conclusory statement is inadmissible. This is the basis by which science rejects most anecdotal evidence as evidence in favor of the asserted cause. It doesn't matter how many witnesses speculate on the causes of the thing they observed. If the causation itself is not part of the observation, then it can't be evidence.
it's disappointing how few claimants are willing to debate in good faith what the standard of proof should be. The discussion quickly devolves into attacks on the character of people who are prepared to justify a higher standard of proof than the claimant can satisfy.