Depends how often it's shoved down your throat.
An obviously intelligent chap like yourself must surely be aware that, when you're bombarded with the same information over and over again, it simply becomes a monotonous drone.
I've been hearing about racism all my life, it was around before I was born, and will be around when I've turned to dust.
That's the human species (and nature) for you I'm afraid, we're all still just Primates at the end of the day, with the 'unconscious' traits of tribalism and territoriality still there in our biological makeup.
Given another 50 years you might reduce it to a minimal acceptable level, but with the threats of Global Warming (another monotonous drone), ever increasing population, food/water shortages, and madmen with red buttons, it could all come back very quickly with loud bangs and mushroom clouds
. . . or of course a meteor strike, Yellowstone eruption, another Krakatoa etc
