If you want to feel morally superior because you commute by bike, feel free to do so. But keep in mind that everybody has their own circumstances in life and what is easy for you to do may not be practical for your neighbor.
Many people live too far away from work to cycle. Many people have to pick kids up at school or daycare after work. Many people do not have the fitness to bike to work. Many people need to transport a bunch of stuff, are afraid of traffic, or just don't like to ride a bike. Maybe they have not yet achieved velo-enlightenment as you have. Be patient with them.
It's probably best to build your own moral foundations rather than tread upon others'. Besides, the guy who walks to work considers you his moral inferior.