I totally agree with this. I would add that it's well beyond the discussion boards. It's probably most clear there and it's well possible we learned it there and then took it into our social interactions everywhere, but the majority of my irl interactions—except with my closest friends—are sorta like this. Sometimes I think its ADHD, other times I think it could be any number of things, but I think to say anything that isn't dead simple (or in dead agreement with the other person), you need a few sentences. Often, you need to hear the third sentence before the first will make sense. But if you get distracted by the first one or can't suspend your disagreement enough to get to the third you will think the person is mistaken. You'll think that about both their first point and the larger one, which you didn't really hear or even get to but thought you did. So the speaker does the hedging each sentence in hopes of getting to the third (or whatever) sentence.