I presume you're referring to the prevalence of black athletes in some sports, particularly basketball where thy are way over-represented. But that is in fact the result of meritocracy. This is so dreadful to some people that last year there was an attempt to form a whites-only basketball league, although the chances of this going anywhere are negligible.
http://en.wikipedia.org/wiki/Baseball_color_line
http://en.wikipedia.org/wiki/Black_Fives
http://en.wikipedia.org/wiki/Black_players_in_American_profe...
http://africanamericanhistorysp2014.voices.wooster.edu/racis...
http://www.thenation.com/article/all-white-basketball-league...
I don't have a firm opinion about diversity in tech companies, but your comment suggests you're unaware of the historical context.