Yes but WDBSA, MY point was that a single stupid cyclist doesn't a) tell you anything about the sensible majority or b) detract from the right of cyclists as a whole to be treated courteously.
We could bang on all night about silly things we've seen individual people doing - but it still doesn't make blanket hostility like the OP's post ok.
Also your point about riding defensively not being a good idea is very ill-informed. So what if people try to over-take? They would try to overtake anyway, even if you were squeezed into the hedge. The difference is that if the cyclist is squeezed into the hedge, they bear all the risk. The car is more likely to try to squeeze past on a bend, and if the car makes a mistake there is no margin for error - the cyclist gets crushed between the hedge and the car.
Whereas if the cyclist is out in the road, the overtaking becomes dangerous for the driver, because they are forced to put themselves in the path of the oncoming traffic. If they make an error and overtake dangerously, the car is likely to suffer, but the cyclist can swerve to the left and has a margin of safety.
Also cycling far out means you are likely to be seen sooner by cars coming round a blind bend - if you think about the line of sight round a bend, you see the centre of the road before you see the left hand edge.
You are confusing what feels dangerous to you, as a driver, with what is dangerous for the cyclist.
Many studies have proved that cycling far out is much safer, forces cars to overtake more appropriately, and results in fewer fatalities. It is a routinely taught technique in cycling safety courses.
An interesting stat is that although there are many more male cyclists, women have disproportionately more accidents and fatalities. It is thought that this is precisely because women cycle more "politely" - hugging the left, not positioning themselves centrally at lights, generally effacing themselves on the road so that cars don't notice them and consequently they get hit more frequently.
A driver annoying you has at least achieved one very important thing - you have NOTICED them. You are annoyed because you are having to modify your driving behaviour, but you have modified your behaviour which is the key thing. The most unsafe cyclist is the one you don't even register - the one cycling slowly, hugging the hedge, who you don't notice until too late, after your wing has clipped their pannier at 40 mph.