I can get preachy about bike commuting, because I think it really really REALLY is a good thing, for so many people and for society as a whole. But I know it annoys people, especially the ones who already have a bad conscience about driving too much or exercising too little, so I make an effort and restrain myself. We bought a car 10 years ago ourselves, and didn't automatically morph into brainless pudgy idiots frittering away our income in gas money after all, but we did get the freedom to haul large objects and go skiing and hiking in different areas without having to borrow or rent a car.

It can be a fine line, sometimes, being enthusiastic about one's own choices without being too denigrating about others. I can usually get away with just saying how much I dislike driving, and getting stuck in traffic, without too much of the "how can you bear this everyday??"-tone