Correct. Individuals do not live 403 years, but things that have been done by individuals in the past can still effect today. I have read "Post Traumatic Slave Syndrome" by Dr. Joy Degruy and "Slavery, the African American Psychic Trauma by Abdul Latif. Both interesting. There is also a book titled "Breaking the Chains of Psychological Slavery by Na'im Akbar. (In his seminal treatise on the residual effects of slavery, Akbar (1996) maintained the social and psychological impact of enslavement persisted across generations and still affects the African American personality.)
What I don't understand about the initial post is who is doing this judging of white folks. I don't hear or see any such judgement where I am. If stating facts about the past isn't allowed then we can not learn from it. If pointing out the errors in our country's history isn't allowed then we are not being totally honest with ourselves as a nation.
If someone accuses me of something I had nothing to do with, I simply dismiss it. I do not let it bother me. If, however, there is even a tiny little bit of truth in that judgement it can cause guilt and defensiveness. And defensiveness is what seems to be the biggest response when someone is called a racist or an immoral person. As someone once said, "I think he doth protest too much!"