Because it’s pathetic. Since when are gender pronouns malleable? 99.9% of us fit in one of two groups. But I guess in the last 20 years science just decided to change.Is your mind so narrow that you can't accept an additional character preference? So what if the game can call someone they? Nobody's making you choose it.
At least don't try to veil your butthurt in "but how is that hardcore?" Just say what you're really thinking.