That is a really inspiring story. However, the anti-white bigot you describe is an invented stawman. There is no significant group of people saying that white people today are responsible for their ancestors' actions. No one is asking you to feel guilty about the past. They're asking you to not be racist now, and to be aware that racists are still out there doing damage to peoples lives. I think your story is actually a perfect example of how people need to act today when they encounter lingering racism.