If people are bothered b/c you ride to work, ask them why. Really, what is the trouble with something as simple and harmless as riding a bike to work. You dont take up a parking spot, there's a good chance you'll be on time or early, you'll probably be feelin' good from the ride and all those endorphins so that would help with your work ethic, etc. So, why would they be bothered? Easy, its something they know they should do too, but just dont for whatever reason.
I work in a similar office, where they all act as if riding a bike to work is just crazy and "dont live", but I dont care, cause I love to do it. The only issue I have: cold showers ! They haven't fixed the cold/hot water showers in the womens bathroom since the hurricaines.