Did that. The Merriam-Webster, in fact. Here's what they said:
> There are several meanings of ignorant, all of which are concerned with a lack of knowledge in some sense; some of these are more insulting than others, and care should be exercised before applying this word to people who you do not wish to offend. Saying “They were ignorant of most of the laws of physics” means that the people in question did not have a specific body of learning. Saying “You are an ignorant person” is possibly describing someone as primitive, crude, or uncivilized.
https://www.merriam-webster.com/dictionary/ignorant
I'm going to resist the temptation to call the original author ignorant since I don't want to spawn some sort of infinitely recursive ignorance-accusation chain. Instead, I'll call him unintentionally rude.