That's an impressive group of people you work with. I haven't experienced that kind of immaturity since 8th grade. Still, I would likely "tone it down" a bit. I.E. no spandex, don't wear the helmet off the bike, etc. It's weird enough to others when they see someone riding a bike to work without adding the ugly and strange clothing to the mix. Whether we like it or not, people are more of a herd animal and operate on a social level that requires some fitting in.

Other than baggy bike shorts, I tend to not wear anything that looks cycling specific when I arrive at work. Part of that is personal preference and part is not to come across like an alien. Thankfully, my co-workers have never expressed any negative attitudes toward my biking other than concern or surprise on the rainy days. I do think that the extra equipment and clothing makes the idea of biking to work seem more unapproachable to people so I'm happy not to contribute to that perception.