Redneck with the camera is an idiot. Its common courtesy to let merging traffic merge onto the highway. Either slow down or switch lanes. He was definitely in the wrong here, truck driver did nothing wrong in this case.
However, I will say this, I've been almost hit numerous times by truckers who aren't paying attention on the road, or flat out falling asleep at the wheel. There are legit problems with truckers sharing the road with regular cars, but this video just shows a trucker merging and an asshole trying to start shit.
I don't remember where I saw this, but I think its some state in the US who either have or want to have trucker-only highways which run parallel to regular highways. This is actually a great idea IMO.