In baseball, those "traditions" didn't exist until the 1880s, when teams agreed to release all of their black players to appease some loudmouthed racists. A shit-fit thrown by the worst segment of society was enough to keep black players from the major leagues until Jackie Robinson broke the barrier in 1947 ... which, of course, earned him death threats. Good thing that'd never happen these days.
Who could've foreseen ... that the 1940s threats would have more caps?
As recently as the late '80s, respected sports assholes matter-of-factly explained that black people coaching would be unfair to whites, or that they simply lacked the mental "necessities" to be competent managers. While he was at it, that last guy also claimed that there weren't any successful black swimmers -- not due to a lack of opportunities, but "because they don't have the buoyancy."
Adam Pretty/Getty Images, Mike Hewitt/Getty Images
They have even less buoyancy now, with all those medals weighing them down.