Unless you have 8 kabillion dangles on it, for a lot of people, you can't even tell what the pin IS unless you get up close to it - and considering where pins are worn, you have a definite sexual harassment suit going on if that happens.
I don't think being a member of a GLO compares to either sexual orientation or political affiliation - since you can be of any political party and any sexual orientation, and still be in a GLO. It's apples and oranges.
Back to the NPHC members: pretty much every day, I see women toting their AKA/DST/ZPhiB/SGRho bags, or with stickers on their cars - and I mean women who haven't been in college for a while. This city being what it is, I'm guessing some of them work in offices that are mainly white and full of people who have no clue about graduate membership or anything like that and think that all fraternities and sororities are pretty much the same. But guess what? They're proud enough of their affiliation that they aren't going to hide it for fear of what some closed-minded person might think. And like I said, until the NPC and NIC groups start behaving like that, we're going to have the same problem with everyone thinking "being Greek is only a college thing."