[Geir can't imagine what one has to do with the other either, but none of the logical chains that take him to "why would someone ask that question?" take him to a good place. he's a bit tired of people being shocked he can't read, but if Noctis is asking why he can't read if he can talk, it implies something more -- that if he can't read he's some kind of beast that can't reason and speak, either. he decides not to read that far into it, but his tone does get a bit more clipped in his response.]

Why can't anyone do anything? I never learned. I'll pass on your question.