I would say Mr Barber is the one with a "dark void" in this soul. And BTW, the Christian sexual ethic hasn't been followed by Christians for 60 years. And no fault divorce has done more damage to marriage and the family than gay marriage could ever do. But Christians never want to talk about no fault divorce because they like it.
Nonewithstanding his blowharding, Mr Barber is right that in some limited cases, Christians and others have been sued by gay couples for not wanting to participate in a gay wedding. This is an injustice, however, in most places where gay marriage has been made legal they have put exemptions for wedding chapels and other wedding vendors.