Those guys look like they just realised how stupid they looked and now it's easier to say they were tricked into saying it rather than admit thats what they really think.
Just because they were pissed when they said it doesn't mean they didn't mean what they said.
Also, they weren't that drunk in the film. They were at asshole-level rather than pissing-in-their-pants level.
Definitely a case of "Fuck, we're never going to get our holes now or ever be employed again."
They can say what they like, but they did sign consent forms. How can they prove they were drunk when they did?
Shanghaied. Deadly. I'd almost feel sorry for them if they weren't such wankers.