I'm all for freedom of expression, and freedom of reaction to that expression - sans violence, of course. I don't think there is anything wrong with OKCupid urging a boycott for whatever reasons. You might think that they "shouldn't", but that's opinion. They should be free to conduct business however they so choose.
However, I have to ask: are they currently boycotting every other company that employ people opposed to gay marriage? Is it a question that they ask potential business partners? Do they deny people access to their service if they oppose gay marriage? Is that a question they're legally allowed to ask? Because, if they're not going that far with this, then even though I'm all for people taking a stand, it feels pretty damn hollow - and I wouldn't be surprised if it were a business move of some kind, or a marketing stunt, and little else.
On a more personal note, and somewhat off topic I suppose, I think we need to be careful with how far we're OK with digging. This gentlemen made a US$1,000.00 political donation from his personal finances to support the democratic process in a non-violent way. Regardless of ones personal opinion on this topic, he didn't break the law and did not harm anyone. Is he restricting people's rights, via the democratic process? Of course. But, gay marriage will be legalised in Western societies via the democratic process - without bloodshed - within a few years time. It's a statistical inevitability at this point. Time is against the opposition.
Once gay marriage is legalised, are we going to continue on this path? We ask for non-violence, we ask for democratically elected leaders producing democratically elected laws, and we ask for tolerance. And we're getting everything. I don't know - I feel like there needs to be a line somewhere.
The law itself respects everyone - religious, atheists, environmentalists, industrialists, capitalists, racists, anti-homosexuals, sexists - and says that we're all allowed to believe whatever we want, as long as we're not hurting people. Democracy ensures that whatever the majority believes, will eventually be what the law reflects. I think we need to be careful that we don't overstep, and start bullying people. There's no law, nor should there be, against being a dick. And that protects each and everyone of us if we have unpopular beliefs and opinions: freedom of expression, and freedom of reaction to that expression - sans violence, of course.