Reading through this thread, I have the impression that racism is seen as some kind of severe disease which has infected mankind but is happily irradicable if only the great and good in our world (particularly the younger members of this group) were listened to.
Of course, it hasn't infected everybody but just those who coincidentally were "bad people" in the first place.
Unfortunately, racism, homophobia and most other reasons for feeling uncomfortable in the presence of people who are different is just a part of the tribalism that comes naturally to us and many other animals.
This tribalism is how we evolved and we evolved like this because it helped us survive. Tribes who were not suspicious and uncomfortable with the proximity of other tribes generally got massacred and devoured with the result that their "neighborly" genes didn't get to be passed along to modern times.
Now, of course, tribalism is a much less important part of our survival armoury than it was a hundred thousand years ago but those cursed genes are still in our DNA.
Therefore, much as racism is an extremely unpleasant feature of present-day society (indeed, I have been the victim of it myself many times), it really is just part of being human.
Those who say they are not, and never have been, racist are, I think, merely succumbing to another part of being human which is self-delusion.
When the soccer/baseball/football team that you support loses to its main rival do you rush to congratulate the supporters of the rival team and genuinely feel happy for their triumph? Of course not, But that's tribalism.