The most annoying and unsettling around here are GUYS that tailgate motorcycles. I had two yesterday do me that way on a two lane while Linda and I were out. I was doin the speed limit, and they had plenty of room to pass. Usually I turn around a little, and look, and they seem to get uncomfortable, and either back off, or go ahead and pass. If that doesn't work, I start slowin down. That usually gets the problem solved, and they go on.
I think it's mostly DWHIA, but there are aggressive drivers, and their usually men around here. The women, young girls, and young guys, are just stupid when it comes to cars and phones.
Another annoying driver however, is the crotch rocket crowd. They too, are rude, and self centered many times. They weave thru traffic including motorcycle traffic, go between cars, and pass on shoulders, run wheelies on busy interstates, passin cars, and other bikes while doin so, and blow by bikes like mine too close, tryin to impress. Also when they finally go too far, and wreck and kill themselves, it ties up traffic for hours.