I've lived in a world where racism, segregation and dscrimination was lawful and then later unlawful. I take it you've only lived in a world where it's been unlawful?
50 years is not enough time to undo almost 200 years of oppresion and damage - THAT's what it has to do with today and if you don't believe racism still exists in this day and age take a look at the enforcement actions taken by some of the various enforcement agencies - EEOC, HUD, some of the states agencies. They are the reason I know for a fact that this crap is still occuring because they publish their work and findings.