Except that the 'trusted figures' include parents that learned it from their 'trusted figures'. We can try making more trusted figures who say 'That's not because of X', and hope that some of the people that trust them put aside what other trusted figures in their lives have said, but that's about all we can do on that front.
Yes, I grew up with a mother who said that she was 'not prejudiced' but that 'blacks and whites shouldn't interact socially'. I'm glad to say that I saw that for what it was, but my older sisters have had a much harder time not pre-judging, although it shows up in different ways.
(@Kythia - isn't that the Internet? A series of tubes operated by robots?)