When the discussion is about "social impact", the conversation is about diversity. Diversity != equality. In the view of many, equality isn't enough, because the "un-oppressed" are fundamentally privileged. The concept of "reverse racism" is there to deflect the inevitable awkward questions that arise, when clearly biased statements are made and practices get institutionalized.
IMO, all this stuff is problematic. I wish we could all embrace the golden rule and move on.