The general argument on race is ugly in many ways, but I think it serves as a good example of something that is controversial today, not 120 years ago. Whether racial differences exist and whether discrimination is useful in some cases is debatable. What's more important is whether you (I'm sorry about the ad hominem) would lie to your child about something as controversial as race just to be in sync with society.

I'm not saying (or rather, I don't want to say) that race exists and discrimination is good. But it's the closest argument we have to the evolution argument of days past.