As Christians we should recognize the language of black lives matter. After all, Jesus did not say "blessed is everyone," but "blessed are the poor" (Luke 6:20). He did not say "as you do it unto everyone, you do it unto me," but "as you do it unto the least" (Matthew 25:40). Jesus did not say "love everyone," but "love your enemies" (Matthew 5:44).
Continually Jesus drew our attention not to loving people "in general" but to specifically caring for those we would tend to discount or condemn. Black lives matter is exactly the kind of thing Jesus would say.