I get what you mean and Im not saying that you are wrong....but at the same time, I completely disagree.
You made a comparison to an all guys alliance. They don't make that alliance just because they are male, they make it of the strong alpha males to run the house, hence why it isn't all males in the alliance. In contrary female alliances try to make it JUST because they are women, that is why they fail because they don't have enough substance to keep them together.
This alliances ONLY commonality is skin tone and they have multiple times voted out the wrong person because of it and are willing to vote out their closest ally to keep it in tact...that makes it nothing like an Alpha male alliance. In contrary as everyone has stated, if numbers were switched and 6 white people went into that game and openly said they refuse to vote out the other 5 just because they have the same skin color there would be a mob at CBS gates and klan hoods being thrown over the walls. To do something simply because of someones race is the definition of old school racism, might not be what people use today but its what racism really is.
Heck, even if you want to us the BS leftist PC definition and say you can only be racist if you have power then this situation even fits that, because they cookout has had the power for weeks and is exerting that power solely based on race.