Its not like pool players are naturally less biased than other people, and I certainly don't believe that people just leave their preconceptions at the door when they enter a pool hall. I believe that what it is, in the final analysis, is that the balls speak for themselves. If a player's game is beautiful and logical (and jam up!) it just is. It is self-evident, it transcends all barriers of race and culture and it displays, for all to see, the intelligence, creativity and will of it's owner. In that sense, pool is like music in that its a universal language which allows human beings to reach out across the chasms that so divide them in the outside world.
The other thing, IMHO, that bonds pool players of all stripes is the fact that it is such a distinct sub-culture. As we all know, the network of good players is a relatively small and inbred one with linkages that extend across the globe. When you recognize another player, you have no choice but to acknowledge the talent, work and dedication by which he achieved this status. If you're in the subculture, you compete and gamble with and against, lend and borrow from, and trade information with other members of that fraternity, and a bond inevitably develops. If you're in, you're in and that's all there is to it!
Pool is a sterling example of how meaningful interaction across racial and cultural lines can lead to greater tolerance and understanding. If nothing else, it can be stated without fear of meaningful contradiction that pool players across the globe share mutual respect and acknowledgement of each others' humanity. Its a lot more than can be said for most aspects of society, and its not a bad place to start.