I think PalidinX13 has it right.
If the only words your coworkers hear are "fps, ft-pounds, ten-ring, double tap, crush cavity, hi-cap, etc" they might get the idea you are a psycho with a one-track mind.
But, if you also chat about the damn roof that's leaking again, picking the kids up from teeball, having lunch with your elderly mother, mowing the lawn, changing the oil.... they will see that you are a normal guy (or gal) and have firearms as ONE of your many interests, not the sole interest.
(They don't need to know that it's your main interest though.
)
That said, I do talk guns at work, but only a bit more than other chitchat.
(I don't get too much into "Klinton is a sleezball", as some of the sheeple are so taken in by his (yecch) charm, that there is no talking to them. The vast majority of the country however don't have much real knowledge, nor a firm stance on guns. They are largely fence-sitters.)
-Kframe