When people post misleading and outright false tripe like that, other people are going to point out their mistakes. When people call posts pointing out verifiable facts as "disingenuous", other people will note that as well.
See, I too can avoid responsibility for responding directly by pretending to be talking about "people" when referring to facts in a post only one person has posted. But I don't do that. I look people in the eye... figuratively, of course... when I am speaking or responding directly to them. It's easy. You should try it.