It would be one thing if she had a clear attitude of, "I'm communicating at my top level, and the people with whom I'm communicating can keep up." Even if her top level were well behind mine, I could respect her stance and probably wouldn't find her (as) annoying. But the fact that she seems to think that I need little parentheticals to help me understand what it means for something to have endured (it lasted) or made a difference (it matters)... That means she's communicating at her top level AND she thinks I need help keeping up.
What's worse, in this case, is that it's in a business context, and it's not just me to whom she's attempting to talk down. In fact, the group to which this communication was addressed is extremely sharp. This, in turn, makes me embarrassed for Miss Down-Talk, because it's obvious that she's in over her head in communicating with us, and she doesn't even realize it. But that doesn't make me like her or her behavior any more than I already do(n't).