Great advice here: Thabiti's Top Ten Tips for Talking About Race:
1. Don't talk about race.
2. When you do talk about race, don't tell people you're "color blind."
3. When you do talk about race, be sure to empathize wherever you can.
4. When you do talk about race, be sure to call injustice injustice.
5. When you do talk about race, be honest.
6. When you do talk about race, be patient.
7. When you do talk about race, please fight against the tendency to stereotype.
8. When you do talk about race, accept legitimate responsibility but refuse illegitimate guilt.
9. When you do talk about race, go ahead and offend.
10. When you do talk about race, root the conversation in the Gospel.
Read the whole thing.