There's a big difference between discriminating against a person based on their beliefs and trying to prevent discrimination based on beliefs. This comment is shocking in that you not only miss that difference, but imply that someone attempting to prevent discrimination is more likely to be a party to discrimination!
Holding a religious belief is one thing, and I'd be upset if OKC was discriminating against any group for holding a personal religious view. You cross a line when you try to outlaw something (that does not infringe on another's rights) based on personal or religious belief.
I don't care at all if Brendan Eich is or is not gay. I'd be saddened if he thought it was immoral, but grant him the right. What upsets me is that he's willing to donate money to organizations that, in my view, encourage discrimination based on sexual orientation.
Everyone is entitled to their own beliefs, so long as those beliefs don't lead to actions that infringe on the rights of others. I believe Brendan Eich has crossed that line, and that OKC is to be praised for exercising their right to free speech in defense of equality.