How would you explain owning Nazi and KKK memorabilia to your jewish colleague?

Well you yourself explained it pretty well...your grandfather left those things and 1-memories/possessions of your grandfather 2-part of history 3-monetary value. What are you supposed to do? Throw them away? Whether your a facist neo Nazi or not is nobody's business. I would love to see your collection!!!! Your colleague exaggerated a bit by screaming and leaving...she shouldn't have been snooping and she could've calmly Asked you about the objects...why you had them etc.