I don't know about the smaller towns in Georgia, but we (Jack the Sailor and I) are in Columbus, which is about an hour and a half from Atlanta, and we go to Atlanta about once a month. JtS is Canadian. We have a Canadian flag where the front license plate goes on one of our cars. We haven't had any trouble so far. Both Atlanta and Columbus are fairly international cities, so maybe the people around here are just used to being around people from all over the world. Plus, there is a very strong culture of politeness here. Being Canadian, that's one of the things JtS really likes about this area ;-)

JtS says you're going to have to get get Georgia licence plates and a Georgia driver's licence within 30 days of coming here, so if you get your tags right away, that might give you some peace of mind. He also says that nobody here will know you're Canadian just from talking to you unless you tell them.