It's worth noting that opposing gay marriage is not substantially different than opposing any other sort of human rights. Would you have been fine with Brendan Eich donating in support of an anti-miscegenation law, or funding an effort to revoke women's suffrage? If so, that's at least consistent, and I suppose I can respect that. But too many people acted like gay rights are just a minor thing, not worth getting fussed about, compared to other human rights.