I wear gaming shirts and such sometimes, but for the most part I don't really broadcast my gaming habbits simply because I don't see it as something that people who don't know me need to know, just like any other hobby imo.
edit: I reread the op and realized this is more about hiding it from friends and family so in that case no I don't do that but I've also never realy gone out of my way to mention it either, though at some point it has come up with everyone I know...