She's unaware or unknowledgeable that a comment like this would offend tons of people, thus making her ignorant and a comment like this one ignorant (her argument about black vs. white prejudice in the South comes off ignorant, too). But you are right. Being ignorant has little to do with being nice or mean. Perhaps I used the wrong term because I think she was
very aware when she made this comment, which would mean she's not a nice, old innocent lady like some of you fools are making her out to be.
The point is, nice people don't make comments like this one or the other comments she has made in the past.