I am a Red Sox fan. (I'm sorry.) Being a Red Sox fan is kind of like owning an iPhone used to be: at one point, you were unique, now every third person is just like you.
My instinctive response is to point out that I'm not one of THOSE people- I've been a fan since the Carter Administration. I root when we're good, like 2013, and I root for the dog's breakfast group therapy teams like 2012 and 2011, and I root for the grossly overrated teams like 1995. As Jerry Seinfeld once put it, I'm rooting for laundry, and it's too late for me to change now.
But that's not the right way to act. When you love something, the natural response is to share it, not push people away from it, and just because I know who Jimmy Collins was and what Duffy's Cliff was and who owned the Third Base Saloon, that doesn't make me a better fan than you. It just makes me a bigger nerd.