When I was younger, wearing black socks with anything other than dress shoes was considered a fashion faux pas. The highest crime was to wear black socks with sandals.
Then Nike made black socks cool. All it takes is the 'swish' of the Nike magic wand being waved over feet of men everywhere, and black socks became cool.
Nike is being true to their brand.
Sports warriors wear uniforms, civilians wear socks.
Black is just part of the uniform...