Speaking as a driver for 20 years (10 years commercially) and a part time cyclist for the last 5 years, I have to be honest and tell you that cyclists really do get a raw deal on the roads, however there are bad cyclists as well as bad drivers. My twice a day 7 mile trip across the city usually means at least 4 or 5 dangerous encounters with cars.
The thing that seems to really annoy car drivers is the "jumping red lights" issue. What advantage do you think a cyclist gains from going through a red light? Realistically, they are not really going to get to their destination any quicker, and certainly not quicker than the driver who will pass them further up the road when it is much safer to do so.
The reason cyclists go through red lights is because it is simply SAFER to get yourself away before all the other traffic starts moving.
Imagine cycling down Bitterne Road towards the City Centre and wanting to turn right into bullar Road. Do you think cyclists look for a gap on a dual carriage way with cars doing 50mph+ to then pull out into the outside lane ? It would not only hold the traffic up but would also tempt drivers into performing dangerous undertaking. So what would you do??
Have a think about a cyclists alternitives next time you see one...