I used to be friendly with a movie star (though her career was in a slump at the time I knew her), and once, when we were talking about road rage, she said, “I always feel funny about flipping people off. I think it might be someone who can give me a job.”
For similar reasons, actors tend to be unnaturally upbeat in interviews. What did you think of the director? Oh, he’s great; he’s a genius. And the cast? They were wonderful, all of them; I was in heaven every day on the set.
But actors in private are a different story. I think such-and-such is awful, they’ll tell you; it’s bullshit that he got such great reviews. Of course, it also works the opposite way: actors love as much as they hate, though they might not want their enthusiasms broadcast, knowing how easily they can be misconstrued.