I'm not entirely sure which side to take here, stupid grey morality.
On one hand, yes, gay rights is a good thing, equality for all and all that jazz, and anyone who actively funds the banning of gay marriage frankly isn't someone I'd want to be around
On the other hand, that was six years ago. I can't approve of demonizing an entire company just because of one guy's douchebag history/personal belief. He is not his company. This would be like if you went onto an atheist website on a windows and a message popped up saying "hey, did you know Bill Gates* is Christian? you don't want to support a christian company, do you? I'd recommend switching to a mac." And, yes, I know that is a bit hyperbolas in comparison, but I think my point stands
*I actually have no ideas on the Gateskeeper's religious beliefs, so don't bother correcting that hypothetical.