Some motorists just don't like being over taken. I usually slot back into the queue a couple of cars back from the stop line, the exact position of this varies according to the situation/ traffic. 99.9% of the time there's never an issue with this. Occaisionally however its usually the same situation/ location there's a queue of 15 or 20 vehicles, I over take most of them till I come to a bus/ HGV on a bend about 5 or 6 vehicles back; my visisibility is restricted, the traffic stationary so I pull in just to the front and right of the following car. I don't know why but the following driver sometimes takes offence to this, parppp!; there's nowhere for them to go and because I'm to the right of them its not as if I would cause them to brake, anyway they are stationary and when the lights do change, I get a draught of the bus/hgv and don't slow them down

. Touch wood it's not happened for quite a while maybe I've got slightly better over time at picking the correct gap/ filtering back in, the OP will to given time, lesson learnt.