I don't believe the proportion of assholes among truckers is any more or less than the general population. We are just regular folks after all.
It's just that when a trucker is an asshole, it is on display for all to see.
Speed limiters exist for good reasons, but they can cause no end of frustration for both those driving speed limited vehicles and every one else that has to cope with them.
The keep right except to pass rule, whether written or implied.is a good way to keep order, but when drivers don't seem to know what the gas pedal is for when accessing on ramps, keeping to the right lane in dense traffic is stressful in a large vehicle.
I spent the last couple of years of my career pulling double 53 footers on the Detroit/Windsor to Montreal corridor through some of the busiest traffic in North America.
Our speed limiters were set at 90 kmh (56mph) so even asking politely for a lane change when you are 130 ft long travelling at a substantially slower speed than the traffic flow was pointless. All you can do is keep the right lane and watch every vehicle merging from the right for signs that they were going to panic and run themselves out of room rather than just getting on the gas and getting out there.
There are times when inconveniencing other traffic is just unavoidable, and I have been the recipient of the one finger salute on occasion. However, my motto as a professional driver with regard to the motoring public was, your convenience is not my primary concern. Your safety is.