I think the point was not that America has solved racism, but that it is a common refrain of some Europeans to point to America's race problems as somehow indicative of the backwardness of Americans, while they smugly pat themselves on the back for being the progressive ideal of tolerance. But European countries have never had the kind of racial divisions that the US has. Until roughly 50 years ago, there was basically no significant non-white population in Europe. The US has had a significant black population for 400 years. And we now have a huge brown population as well. And now that Europe has acquired a significant non-white population, lo and behold, you see a lot of the same racial issues that the US faces.