Although I can’t speak for others, I wasn’t chastising Nolan’s Batman movies for not having enough leading actors of color--there weren't any to begin with--I was merely pointing out people claiming Nolan's movies are full of diversity as an argument that doesn't hold much water when you really look deeper at screen time and role substance for characters played by minorities. Bringing up other comic book movies and other directors fails to address the topic at hand. We're not lumping Nolan into the same fundamental problem with Hollywood that has plagued this genre for decades, we're looking at inspiring directors/creative minds who make it a part of their mission to tell rich stories from a number of perspectives. And often, these perspectives can be by casting minorities as main characters because it tells the audience (which isn't only white by the way) that protagonist and antagonist can be played by anyone. You mention that we should look at the talent involved instead of the race of the actors themselves which is easier said than done when most actors--especially in CBM are 90%+ white. Directors have the ability to advocate for specific actors to play certain roles, it's not only about how talented the actor is which is evident in Nolan movies as he commonly uses certain actors again and again across his filmography.
No one said Abrams or Tarantino were good directors purely because they have diverse cast, I used them as an example because similar to Nolan, each of their films are unique from the one prior but they still manage to find balances between inclusiveness and storytelling--the two aren't mutually exclusive. The rumor of Zoe being told that she appeared "too urban" for a two-minute role in TDKR speaks to the problem we're discussing. You can simply say she dodged a bullet because the role wouldn't have had any meat to begin with, but for being passed by a casting director because of how you look--obviously racially motivated--is a bigger issue altogether.