Assuming good intentions here, but it is incredibly naive to not anticipate how this could lead to greater division and negative user interactions. If a user can sort by race they can also effectively create a suppression list for other races limiting exposure to new perspectives and ideas.

Humans have an inate desire to sort and categorize, but I find it backwards and dehumanizing to do so for people. I understand there is value for race and gender minorities and allies to find and support each other, but by creating labels you express your differences rather than comonalities. It is in our commonalities where we relate and find compassion for each other. When differences are highlighted in such binary terms we all become characitures of our true selves.