I like to think I don't come across as aloof, self-centered, and dismissive, but -- like I mentioned in another comment -- who really knows what another thinks of them? Perhaps that's a good area to validate my assumptions so that I'm not shooting myself in the foot.
And on your last point, I definitely agree. Sometimes however you can find yourself in a situation where those barriers don't really apply and you can have a deep, interesting conversation with little prompting. I guess the heart of my question is about where people find those interesting conversations with greater regularity.