Cyclists are not the scourge of the streets, motorised vehicles are, particularly those carrying just one person.
Part of the problem is the sheer inefficiency of the motor car as a mode of single person transport in an urban setting. There is simply not enough space for everyone to travel this way, but the motorist is encouraged by clever advertising, freedom of the roads etc.. little wonder those taken in by the hype have feelings of frustration when people on bikes can permeate cities much more effectively.
The motorists complaining about cyclists causing delays on rural roads can also be accused of selective blindness. Cyclists can cause minor delays there, but these are far outweighed by the delays caused by cars to pedestrian travel in the urban setting where pedestrians are required to wait quite long periods for a break in motorised traffic, or are forced to take longer routes in order to find safe road crossing places.
Makes me wonder if the type of driver who considers their journey delayed by cyclists has similar feelings when as pedestrians they wait for a break in the motor traffic to allow them to cross the road.