@gunslingerdick actually made some decent points about tribalism. Its a necessary animal impulse that helps keep us alive. Without a preference for the familiar, its unlikely that we would be able to build the trust that is at the foundation of our societies. The idea that its just some ignorant bias is a misrepresentation of what tribalism actually is.
However, its still helpful to recognize and challenge that bias. If you only eat at the local restaurant you know and love, only talk to your neighbors you know, and stick to the same bars you always go to, with the same crappy beer, then you're going to miss out on a lot of awesome stuff. You don't have to feel guilty about preferring whats familiar, but it doesn't hurt to recognize that as a shortcoming in some cases.