"Admitting you drive a motorbike automatically excludes you from complaining about other peoples driving, pal."
Actually most studies done have indicated that Motorcyclists make much better drivers, cause fewer accidents, and that most accidents involving motorcyclists are actually caused by another vehicle. Let us break this down:
"follows the car in front at a distance of no more than 6 inches from the nearside rear bumper"
Stopping distance for a bike is generally shorter than a car. Add to this a motorcyclist is generally higher than their car driving counterpart, giving a better view of traffic ahead. Hence they do not need to leave as great a stopping distance between them and the car in front.
Even ignoring that, there are plenty of motorcyclists, like myself, who actually leave more room in front than the average car driver due to the consequences if they are in an accident. Also, I seen plenty of cars driving right up the vehicle in front's exhaust pipe. You get bad road users in all classes of vehicle.
"the belief that its ok for you to overtake stationary traffic at a junction"
Actually this IS OK. It is mentioned in the highway code, and is known as filtering. So long as it is done at a sensible speed, with the awareness that other road users may not expect you to be there, there is no problem. See http://www.direct.gov.uk/en/TravelAndTransport/Highwaycode/DG_069854 (88)
I have of course seen motorcyclists filtering at what I would consider unsafe speeds on the motorway, but then again I have seen cars weaving in and out of traffic on the motorway at unsafe speeds, so once again it cuts both ways.
"the belief that ... the dividing chevrons on a dual carriageway are in fact an overtaking lane for motorcycles"
I agree that this is not a good idea, and is actually illegal if the lines surrounding it are solid, but once again I have seen cars do the same when circumstances allow, so you can not use it as a specific argument against the driving skills of motorcyclists.
Bottom line, Adam: Do not make sweeping generalisations about a group of people without having the facts. There are many good motorcyclists, and a few bad ones who give the rest of us a bad name. Many car drivers also see typical motorcyclist behaviour as dangerous purely because they do not know, having never ridden themselves. Of course there are many dickhead bikers out there, but there are also dickhead car/bus/lorry drivers, cyclists, and pedestrians.