I don't know if this is a self-defense mechanism or actually related to the motives of those promoting cryonics in this group, but I've always taken the "you're crazy not to be signed up for cryonics" meme to be intentional overstatement. If the intent is to remind me that things I do may later turn out to be not just wrong, but extremely wrong, it works pretty well.

It's a good topic to explore agreement theory, as different declared-intended-rationalists have different conclusions, and can talk somewhat dispassionately about such disagreement.

I have trouble believing that anyone means it literally, that for most humans a failure to sign up for cryonics at the earliest opportunity is as wrong as believing there's a giant man in the sky who'll punish or reward you after you die.