I think, though, that people we're expecting to know better, and act better, have to be of sound mind.
Someone in their 90s has a brain that's atrophied and very often is has elements of confusion or dementia.
I'm thinking of a younger patient recently who was spewing horrible racial names to staff, but he was not of sound mind because of a condition he had. My heart broke for these people, but they were professionals and understood that this person couldn't be held to the same standard as that of a person of sound mind.
The question, I suppose, is, how and when do you know whether someone is of sound mind or not?
I also agree with Planogirl and Sam that none of us are perfect but many of us (of sound mind) have grown and changed with the times. But not everyone is up to date on every little thing that others who are on social media and such may be, especially if they're a little older. Others mentioned it earlier in the thread, too, that someday it's going to be US who are being told we're out of touch when we're saying things we know today to be ok. And I think Makenzie is right when she says that racism is more than just using a perhaps out of date word without ill intent.
Again, to me, what's really important is how we actually treat people.