[Image description: Reddit post from CptMatt_theTrashCat with 834 upvotes:
I'm going to see if I can explain it a different way:
Imagine a guy who hates disabled people builds a hotel, so he bans all disabled people, and builds it in such a way as to specifically make access difficult for them. Years later he sells the hotel to a new owner who has no problem with disabled people. So you have a hotel where the owner has no problem with the disabled, and neither do any of the staff... however due to the actions of the previous owner, the hotel is still built in such a way that it doesn't accommodate them (no disabled parking, no ramps, no extra considerations, etc.) So although the people currently running it are not actively discriminating, they are operating a system designed to discriminate, and need to fix it even if they aren't to blame for it.
It's the same with racism. The discriminatory practices of the past still have ramifications today, and even if we aren't to blame for them we must recognize them. ]