Not everything is worthy of a 5000 word Atlantic-style deconstruction when presented. I think the community largely embraces Hitchens' Razor. That being the case what is the minimum word count required to issue a dismissal?
I think not. Your position would have us choose between leaving obvious bullshit totally unchallenged or trying to sail upwind into the Bullshit Asymmetry Principle. I, for one, reject both options and am perfectly comfortable with others expressing their disdain succinctly. Tl;dr: pffft.
"You will just have to hear the rule from the site admin, although the cost then to you could be higher."
I doubt that. My engagement with HN is on a level of morbid curiosity bordering on naked disdain. If n-gate was still a thing I probably would have quit checking the site altogether some years ago.