Yep, see that a lot. Bugs the hell out of me when they do it to me. Why do people risk their safety doing that? The farther you are from anyone else on the road, the better. Just stay away from me.
One of the main routes out of our neighborhood is a narrow two-lane winding country road through a deep forest with soft sides and deer running across, and yep, that's where they love to tailgate, even with ice on the road.