I see the aggressive law breaking cyclist all the time and it's a pity that all cyclists get tarred with the same brush.
I'm a great believer in cycling defensively. It's very difficult to argue the point that you are in the right if your brains are spread over a large area of tarmac!
I find professional drivers far more courteous and aware than most private motorists..... especially the school run platoon
Most of them seem to think that cyclist require the same width of road as a cycle tyre.