Then they'd have to deal with it, like Anti-abortion campaigners. The whole purpose of Freedom of Speech is to give everyone a voice. You don't have to agree with them, and the odds are that they would get nowhere because such things have been tried before, but the whole idea that hurling abuse is some kind of solution to possible future problems is absolutely ridiculous.
And the fact is, if we hadn't been hurling insults, they wouldn't have got angry, so we are creating a problem, and then claiming that continuing to create that problem will somehow solve it.
With regards to the idea of mass Gay Marriages, as long as it is on soil where it's legal, there's not a damn thing that can be done about it, and they are within their rights to hold the ceremony, however, once again, there's a difference between defying religious fundamentalism and deliberately going out of our way to insult peoples religion.