I spent ten years working in business environments that applied heavy pressure on me to conform to corporate standards that did not match who I was inside. Attempts at self-expression were met with ridicule (at best) to overt hostility (name-calling and the like) to even being fired for being Wiccan once. And believe it or not, I was working for non-profit organizations in the social services field. Go figure.
If co-workers make you feel uncomfortable for your spiritual choices, the temptation is to retreat into a broom closet. However, probably the thing that will be most effective will be the hardest to accomplish. Instead of hiding your inner self, speak up for yourself firmly, gently, and consistently.
As a Pagan, you have had spiritual experiences that have caused you to look at life from a different perspective... that is so empowering! Use it to your benefit, and don't let them intimidate those changes out of you. When someone makes a crack comment, say something like: "I realize that you're trying to be friendly and joke around, but your comment of be specific here bothered me. In the future, would you mind offer specific suggestion here instead?" This approach keeps the offender from becoming defensive, which tends to reinforce the negative behavior, instead of correcting it.
Expect the comments to escalate for awhile while you reinforce the message of your new boundaries to your co-workers. Most people are a bit uncomfortable around someone they've known a long time who begins to make profound personal life changes. We're creatures of habit, and we tend to sabotage the efforts of people around us. But if you remain polite, friendly, and calm in the face of their negativity, they will gradually come to accept and admire you for it.
Stay grounded, stay calm, stay receptive, and live your new truth. That will shine forth from you, and will become apparent to all.
Namaste.
~Flame RavenHawk
July, 2002