Diversity awareness or lack of it has precisely zero bearing on one's ability to be an effective pilot.
I completely disagree and so do BA. Has it occurred to you that people who don't stop to consider the differences among others generally make poor team players and even worse leaders? Imagine the scenario where a Captain says something upsetting about a subset of society that he feels are beneath him or her - yet the co-pilot is either part of that group or maybe married to somebody in it. Is that co-pilot going now going to go the extra mile to support that Captain (consciously or otherwise)? I doubt it.
Further to that - you obviously misunderstand the point of such questions. Yes, demonstrating that you are aware of cultural issues is a bonus, but they are also looking to see that you are flexible in your approach and open minded.
They're basically looking for people that aren't arseholes. Sometimes I wonder if that's a rare quality.