If you are not American then why comment on American things you don't understand? You obviously don't know about the history of black soldiers or American society to make that comment. It's less about explicit hate and America's history of treating people of color as second class citizens despite being just as American as whites.
Experimentation happened, just not with a super soldier serum of course.
Being sent on one-way missions happened.
Not receiving the same recognition, accolades, status, respect as their white comrades happened.
Again, Marvel typically uses social commentary to come up with plotlines. Bradley represents the stories of black soldiers who fought in the world wars and Vietnam.