I can’t argue that the post was almost certainly not linked to in good faith, and the poster was definitely not going to be interested in hearing counter-points, but I try my best to remember that the comments aren’t for convincing the poster (not worth it, as you said) but to convince the onlooker who’s silently scrolling through conversations about topics they don’t understand.

Those are the people we can reach and teach. Though, of course, in the process we’re likely to get a lot of bad faith responses that will trouble our blood pressure, so, y’know, pick your battles.