Not to mention that the lines are coming from these cool-as-hell anti-heroes that most of the audience is enchanted by. It's interesting that racism is a disqualifying factor for most of the people in the real world that we support (or at least we say it is), but it's okay in the film characters we love. Why aren't we immediately rooting against these characters the second they say something racist? Surely that would be the pose we'd adopt in the real-world. Do we enjoy the power fiction gives us to free ourselves from trying to feel how we THINK we're supposed to feel, instead of how we actually do?

I'm not even criticizing the filmmakers. It's just a pretty interesting insight into the audience.