Maybe "blasted" is an understatement, as Moffat stated he hates them and wished they would go watch another show.
In an interview with BBC Radio Moffat said the following:
"You can imagine how much I hate them."
"I wish they could go and be fans of something else."
The article explained that Who invited a select number of fans to watch the premiere before its debut, and that immediately after - spoilers found their way online.
And that ticked off Moffat.
"It's heartbreaking in a way because you're trying to tell stories, and stories depend on surprise," said Moffat. "So to have some twit who came to a press launch, write up a story in the worst, most ham-fisted English you can imagine, and put it on the internet [is heartbreaking]."
Yeah, that is kinda of a crappy thing to do - especially if you got a special invite. In regards to posting spoilers (we do here), fans are giving the option to read them or not, so there's that. Still, I can sympathize with Moffat's pov as the BBC gave these guys special access.
Moffat goes on to state that the show depends on that element of surprise to shock people.
"Stories depend on shocking people," stated Moffat. "Stories are the moments that you didn't see coming, that are what live in you and burn in you forever.
"If you are denied those, it's vandalism."
What are you gonna do, its the age of information.