[neolithicum]

Ignorance (especially pride about it) is so infuriating because it suggests to people that their knowledge about something is not in any way essential to humans. And this is true about Excel. If someone told me they hadn't heard of WWII or the moon landing then I would be right to be angry as it is information that is really essential to all of us. For anything else, we really shouldn't waste our energy on this infinite source of anger. This is the first time I have heard of that woman, I bet nobody cares about it here. Perhaps other people would be mad about it in the same way you are about her not knowing Excel. I won't disagree with you though that it is very tempting to get annoyed by it :)