Like pedestrians, cyclists and car drivers, there are many different types of bikers, some are responsible gentlemen/ladies of the road, some are suicide cases on two wheels.
My pet hate seems to have disappeared with the changes to motorway roadworks - the ones who filter through to the roadworks and then force their way in front of you, effectively delaying everyone else behind them - and then magically expecting you to keep a safe distance behind them when they decided 6" in front of you was fine to pull in. Some do that at traffic lights where filtering is OK if you have somewhere to go, otherwise wait in turn like the rest of us.
Generally, I like to give bikers a wide berth for their own safety, so I get cross when I see bikers not looking after themselves.
I think the last bad tempered reaction I had from a biker was when I drove a couple of miles along a single carriageway road, carefully following the road markings, and sticking to the speed limit, which I personally believe is the right thing in built up areas. There are lots of bollards, cycle lane causing the lane to weave around, but all quite obvious. Got to the High Street, which has a succession of humped zebra crossings, but as soon as the oncoming traffic cleared, a biker shot past, turning around, flicking the V's and generally suggesting I had been driving inappropriately. His only complaints could have been that driving at the speed limit was too slow for him, or I should have driven up the cycle lane (or indeed pavement) to let him past. He didn't seem to think that riding down a High Street not looking where he was going was a problem.
I will also add that a significant number of motorcyclists think that as they are vulnerable that it is legitimate to ride on full beam everywhere, dazzling people.