Although Mister P's positioning may be a bit off on this, I can see why. I have done this before - the red car is a bit slow to move forward and either you lose momentum and go behind, or try to go around, which leaves you a it badly positioned. But when I have done something like this, the cars behind hang back until I have sorted myself out (and I have given a friendly thankyou for their consideration). The car driver is a bit of an idiot to push through - you would like a driver to help the situation, not push past to make a slightly stupid point. Mind-you this is the kind of driver who would push past if you were driving a car and made a lane mistake, as opposed to act in a considerate manner, so I don't think it is really because you are on a cycle.