Mostly diesel bro trucks or old shitty cars with no exhaust and dark tints. Lately it seems to be drivers of newer Chevy pickups. Not sure why, but I've literally had 4 or 5 problems with these guys. Yesterday I came around a corner and this guy in a newer 1500 Silverado was all the way over in my lane. Not sure how we didn't hit. The day before that a guy in a 2016ish Silverado yelled at some woman in traffic, drove over a median and peeled out into the oncoming side of the road.
Above all I would say people on cell phones though.