> We're not jerks. We're people who notice problems. You're shooting the messenger.

The definition is literally in the title: "disagreeable personalities (selfish, combative, and manipulative)".

So, yes, by definition, disagreeable people are jerks. If that's you, then you, too, are a jerk.

That is completely orthogonal to "people who notice problems". If someone thinks that it's necessary to be "selfish, combative, and manipulative" in order to notice a problem, then that person is not only a jerk, but also deluding themselves that they're just misunderstood.