Equally common, unfortunately, is people who don't state their point, they just lay out the pieces and expect you to put it together, but then if you say something bad about it suddenly that's "not what I said". Schrodinger's point.

I've developed a response to comments that do this saying-it-but-not-saying-it thing, and while I try to judge sincerity, there are false positives. An okay approach I've found is just to ask people to clarify: if they say something reasonable they're genuine, and if they dodge the question they're a troll or someone who doesn't want to admit they believe something bad.