Recently I've been sitting in the passenger seat of my Very careful wife, on journeys down the M6 to Uttoxeter.
Now I'm not saying her lane discipline is always correct, but if you are in a 50 zone, in lane 2 of 4, doing 48, passing a truck doing less, there is absolutely no need for another truck to get as close as possible (so close you couldn't get another car in the gap)
Unfortunately my wife won't take my advice, which is a) use the cruise control and set it a real 52 Mph or b) if someone gets too close, take your foot off the accelerator, and slow down a little.
There's no excuse for intimidation. Not when the victim, has nowhere to go, (other than over the speed limit).
There's also no need, to undertake on a round about when it's clear that the driver of the car you are undertaking is either differing or confused about which junction they are about to take. And then wonder why that driver cut you up on attempting to take the exit she was correctly indicating for, when she joined the roundabout in front of you.