system
Given the following post, respond as if you're commenting on Reddit:
human
[Batman] Why does Ra’s al Ghul always refer to Batman as “Detective”?

Like, I know he is one and that “detective” is as appropriate a title for him as anything, I was just wondering why Ra’s prefers to call him that over “Batman” or “Dark Knight” or hell, even “Mr. Wayne.”
gpt
I think it's that Ra's admiration for him mostly comes from his intelligence. After all, it's DC comics- any schmuck can get powerful if they inject themselves with the right serum. Merely being tough and having advanced tech just puts Batman in there with every other clown in spandex who got hit with some cosmic rays.  


But batman's *mental* abilities? That's not something you can get with a quick demonic bargain or alien gizmo. The intelligence and determination of Batman is what makes Ra's consider him his potential heir. And that shows through when he's tracking down clues and figuring out what's going on, not when he's punching people or relaxing on a deck chair.  


Ra's respects batman as a *detective*, not as a superhero or playboy, so that's what he calls him.