What's the snake look like? Racers don't really get very big. If it is a big shiny blue-black snake it may be an Indigo. If so (and actually this applies to the racers and coachwhips as well) they will actually EAT venomous snakes that they come across. So they aren't bad to have around. Most snakes don't want anything to do with human beings, so if you give them the space, they will get out of your way.
Over the years I have released snakes around here that were long term captives, and amazingly, some will actually follow you around since they got used to me feeding them. A while ago the wife and I were on vacation and a friend of ours stopped by here to check on things while we were gone. When we got back he seemed worried about this snake in the front yard that would raise it's head up a little bit and stare at him. This was a king snake I had released a few weeks prior and he was just looking for a mouse as a hand out. But certainly put my friend on edge.....
Heck, having guard snakes around the house probably isn't a bad idea anyway. Some burglar coming by and seeing snakes coming out of the bushes at him would probably have a heart attack on the spot.