A couple of things, as much as I am a fan of diversity in games, you can have a game of all straight white males without it having to be Call of Duty or a "dudebro" game. Painting not caring about diversity as only wanting to play military shooters in various shades of brown is kind of disingenious.
However, on the other hand... Maybe it isn't about you OP? This strikes me as obvious a question as "Why should I care about people starving in Africa? I have plenty to eat." Before the horde of people jump on me accusing me of comparing famine to lack of diversity in games, no, I am not saying they're comparable in magnitude at all. I'm saying the reason why you should care for both is the same, basic empathy. You're getting what you want, but maybe that's not all that should matter?
Also, you seem to be under the impression that diversification goes hand in hand with low budget artsy indie games. There's a good reason why at the moment it does. Because AAA games are still terrified of showing more than token minorities. They're putting millions of dollars into these games, and they don't want to risk their profit. Frankly, large amounts of the gaming population are giving them every reason to believe that this is the case. The more diversity you show in a game the more people you'll have accusing the game of trying to be SJW bait, or trying to appeal to the devil itself, feminists.
Because of this, the majority of the people who try to have a little diversity in their games are those with small budgets. If more straight white guys care about diversity in games, or at least don't resist its inclusion, then you won't have to dig through indies to find it