I can’t blame the trucker for getting frustrated
Frustration simply has to be handled. (I just un-capitilised HAS, as I needed to control my frustration).
Your anology, and several other sympathisers here seems to be wanting to excuse the truck driver – because he was having a bad day, or something..
He is a professional driver, at the wheel of a massive, heavy, easily lethal vehicle. his actions were literally fractions away from squashing the other (bell-end) driver like a bug, possibly leaving a further trail of destruction behind him as other innocent parties pile into the carnage infront of them.
But at least the truck driver would have got his point across I suppose?
Stop and look at the desctruction these type of drivers cause to families every single day, empathise with their position, and come back and say that it’s ok to swipe a car with an HGV if they’ve been really naughty and wound you up.
Similar analogy for frustrated tree surgeon with chain saw in hand:
‘whats the fuss? he only lost a bit of his arm. Besides, he was really really rude to the tree surgeon’
etc