If you believe an incorrect thing, you are both wrong in your belief and ignorant of the correct belief. It's not a pejorative to say a user has ignorance of a

If you believe an incorrect thing, you are both wrong in your belief and ignorant of the correct belief. It's not a pejorative to say a user has ignorance of a particular fact. It's just a statement about the condition of the user's understanding of reality. (You can also call someone ignorant as an insult, but that's usually not in the context of particular facts. "You are ignorant," is an insult. "That person is ignorant of the situation," is not an insult.)