This is a very nice observation for developing our views about black people.
I am black , an africa man.

I have always have this weak mind whenever i tried having a conversation or start a friendship with white meanwhile he/she does not know what i wanted to share but when this racism act popped up and he/she will either ignored or report spam without hearing my suggestion and my ideas.
i believe this will stop since steemit has create a well understanding community to interact and put aside racism. And to the photography website that doesnt includes black in their galleries i believe this will stop once we dont limit act against racism here.
We have lots of black websites that includes black peoples art but since white people belief that each race has distinct and intrinsic attributes. once this act stopped, that is when black will sow high by showing their talents to white and if its welcomed, their art works will be reviewed.

Thanks