Whilst I admit that many of us have done similar (or worse) things, I do think that these things can ramp up hostility and might elicit some sort of unwarranted resentment in the driver being 'punished' or those following that vehicle.
This is not a criticism - I have done much worse. It's just an observation. It might make you feel good for a moment or two, but it avails you (and the rest of us) nought.
On the OP, I am pretty sure (on the basis of no knowledge at all) that that was ignorance and inexperience rather than bullying. Some drivers are simply unaware of how their vehicles might intimidate or present a risk to other road users.
There may also be an element of "Overtake... Ooops, no, I've got a trailer". I've driven with a trailer quite a lot and on a straight road it can be easy to forget it's there until you squeeze the loud pedal and remember the extra mass. I do not defend this driver for their shocking driving, but I do not think it is bullying. They did, after all, pull back when you indicated. Poor, but not a bully.