Completely out of order for any driver no matter how many wheels he's rolling on to "attack" another driver / rider - however......
The actions of a minority who behave badly give a perception that all those with similar machines are the same, e.g. white van man, lorry drivers, Audi / BMW drivers and of course motorcyclists.
They aren't all the same but that perception changes how the rest of us drive and while most will back off and well out of the way, others do the opposite.
In my area, weekend motorbikes are a real problem and with groups of maybe 3 or 4 to double figures overtaking in heavy traffic, at speed on blind bends and wrong side of double lines is infuriating and downright dangerous, if they want to kill themselves then fine but not innocent families along with them.
I stay well clear where I can but because of the times I've been carved up I view motorcyclists with suspicion and try to give them room when in slow traffic these days as I've had 2 cars scraped by riders zooming up the middle between cars. I hate them doing that and as many of our roads have been narrowed by the formation of cycle lanes while vehicles get wider there's little room.
That said, I followed one of the worst car drivers I've ever seen yesterday, Chavs in a little old Corsa, lowered, big wheels and exhaust nearly as big, scraping along the road. I'd have pulled him over and had a word but they were 4 in the car and didn't fancy being worked over but got my missus to take some video which I passed on to a mate who's a D.I. so they'll be getting a "knock"
I rode motorbikes for many years in my youth and passed the required tests btw, wouldn't now just too bl**dy dangerous in the UK.
Bob