The situation would be something like a student asking a teacher a question. The question isn't well worded, as the student doesn't fully understand the topic on which they're asking the question, and the teacher says the they don't understand the question. Or, the teach might say the question doesn't make sense, or it isn't clear. But to a knowledgeable person, the crux of the question seems clear. The student simply can't word the question well, because they don't understand the topic.
The "teacher" is simply trying to show the student doesn't know what they are talking about and the implication is the teacher knows more. For some reason the teacher doesn't explain and re-word the student's question for them.
It's a sort of pedantry. The teacher is more interested in showing they know more than the student rather than clarifying the question and explaining.
It puts a burden on the student to already know some topic before they can ask a question about it.
The question would be fairly basic. I'm not thinking of complicated questions which could legitimately require clarification.