Before I started riding, I thought all cyclists were idiots unless they were on the sidewalk.
Once I started riding, I realized that all cyclists on the sidewalk are idiots.
I try to be as understanding as possible because most motorists really don't know a cyclist's rights, and unless they start riding or have someone explain to them about bicycle safety, they may never know.
So I make it a point to ride in traffic, obey traffic laws, wave at cars that give me room, and grin behind my ice-covered beard so that people can see how miserable they are in their cars and how happy I am on a bike.