Many years ago, if a conversation about race, history or politics came up with family or neighbors, I would end up making an insensitive comment and often loose the chance of ever discussing those things again, at least with that person or group. How many of us have been in a room or with a group of people, where one person makes a comment that you just cant let it go without countering it with some historical tidbit or logic that in turn, ends up causing an argument?
I think the point I'm trying to make here is that the key is to be subtle. Never try to "win" any discussion. Plant seeds of doubt about their world view with some information and go on about your day, but never give them the whole "documentary" in one sitting. It then becomes an impression that you are "schooling them" on some subject, and they may become intimidated. Invite them to look up the information themselves. If they start to press you or challenge you to an argument, simply refuse, and invite them to look the issues up for themselves. Many will not however, but some will. You are never going to win over every white person to your view of things. Some are simply not going to listen, as they will have to discover it on their own somewhere down the road. Again, the goal is to just be subtle, remain calm and friendly. Nobody likes to be around someone that is always unhappy about one thing or another.
More could probably be said on this, but it needs to be remembered that we are to help our people, not make them look like fools so we can "win" some petty argument and pat ourselves on the back.