unmarked sarcasm whooshes even the mighty users of Lemmy, apparently

The key presses ‘/’ and ‘s’ (in that order) would solve that problem.

Nah, that’s akin to explaining the joke. Well crafted sarcasm needs no callout.

Nah, its just signaling that in fact it is a joke in the first place. And the callout doesn’t happen until the very end, after everything else has already been read, and processed.

Sarcasm can be overly crafted to be indistinguishable from non-sarcasm.