I feel the need to address a few points!!
I commute into the city centre by bike for about 6 months of the year, and go on long leisure rides at the weekend, so consider myself an experienced cyclist. I also drive - so like around 86% of cyclists, I do actually pay vehicle tax - that is what it is - not ROAD tax! Bikes have no fuel emissions, so like other 'green' vehicles, there is no tax to pay.
People in general are just impatient arseholes nowadays - that is the way society is going. Look at the Black Friday carry on. It is depressing. If only we could be more considerate of each other, maybe we would all be that bit happier? My commute involves using a cycle path for a few miles, and I find everyday that I need to cycle slowly and prepare to brake as there are various dogs bouncing around off their leads. I have in the past been knocked off my bike by a dog diving out of the bushes without warning, to be fair the owner was lovely and very sorry, but why not just obey the rules of the path and use a lead? People need to think of others and not just themselves.
The next stage of my journey involves cycling through a bus lane, and it is amazing how many cars attempt to turn left despite me being right beside them - then beep at me for daring to be cycling where I am legally allowed to be.
After the bus lane, I reach a nasty junction, that I now have learned to get off my bike and negotiate by foot, there are zebra crossings so that is safest. Previously, when I cycled it, I was turning left and a taxi undertook me to go straight on - I was milliseconds from getting flattened by him.
I then cycle through a beautiful park. Last week, I got swore at by an older couple - apparently cyclists are all thick therefore I cannot read the signs saying no cycling - I pointed at said sign which clearly stated that cyclists should proceed slowly but need not dismount. They continued to swear at me, I so wished I had a camera as I reckon it would have went viral - I actually found their odd behaviour very funny.
Next, I cycle up a busy road with cars parked across the narrow cycle lane, it is like an obstacle course. If I stay out from the lane, I get shouted at with cars passing extremely close - as I should 'be in the cycle path' apparently (highway code actually states the use of cycle paths is optional). However using the path involves constantly pulling out round parked cars which is really dangerous - I can't win.
I reach my destination and breathe a sigh of relief - I have made it in one piece! To drive there, it would take me at least an hour and parking is very stressful. Cycling takes 45 minutes and parking is available right by the door.
Commuting by bike is incredibly popular. Would car drivers prefer that all of those people added to the congestion by taking their car and parking?
Finally - someone mentioned a cycling test. Do you really believe that prevents people from driving badly? I really don't see that as the solution. I think the issue is that everyone needs to think of others - that means cyclists too!