Same here. A couple of years ago, I was fortunate enough to attend a session on racism at work. Presumably similar to some of the other posters on this thread, I was raised in an almost all-white environment, by parents who would occasionally make racist comments. That, unfortunately, is how things were in the 1970s/80s (think of Archie Bunker and All in the Family, but perhaps not as obvious).
Being raised in that environment most definitely framed my perspective. Even though I convinced myself as an adult that I had no racist thoughts and proclaimed that I was not a racist, I truly believe that my upbringing skewed my perspective, perhaps on a subconscious level. This session I referenced was an eye-opening experience for me, and completely changed my perspective on a bunch of things. When I see some of the comments on here (and especially on Twitter), I firmly believe that many of the derogatory comments about CP and CU have a basis in racism.
The session included a very well-done book on the subject. I need to find it and would be happy to share the title for anyone who cares.
FWIW.