I don't think many people are jumping on Stokes in that thread - to be honest most people are accepting his and his wife's version. I, personally, don't see any other choice than to believe her, given the nature of the story.
But even then, people aren't believing Guido Fawkes. People are making their own judgements of the pictures. Shooting the messenger is an easy way of not engaging - and that applies to all stories. It's not a particular problem in this case because it's just gossip. But it's a huge problem in terms of politics imo. Engage with the message.