The background can usefully affect one's choice of whether, and how, to engage.
In this case, the post already was pretty poor, on its own merits, as has been pretty well covered all over this thread. The added info took it from poor, to poor and risible, and also probably worth ignoring or quickly dismissing with a post (for onlookers) then not continuing to engage, even for those who might otherwise be inclined to start a back-and-forth conversation about it. Like, one is unlikely to dig up some well of hard-won wisdom on this specific topic that might change one's mind, from this poster, by engaging with them, given that background info.
Who's speaking (or writing) matters. It may not matter for determining whether they're right or wrong, but it matters for how (and whether) one responds.
In this case, the post already was pretty poor, on its own merits, as has been pretty well covered all over this thread. The added info took it from poor, to poor and risible, and also probably worth ignoring or quickly dismissing with a post (for onlookers) then not continuing to engage, even for those who might otherwise be inclined to start a back-and-forth conversation about it. Like, one is unlikely to dig up some well of hard-won wisdom on this specific topic that might change one's mind, from this poster, by engaging with them, given that background info.
Who's speaking (or writing) matters. It may not matter for determining whether they're right or wrong, but it matters for how (and whether) one responds.