Could be a projecting thing there. Sort of like when reporters claim the ending of the first Spider-Man was changed because of the World Trade Center attacks.
Perfectly honest, I could have missed it, but I don't think he said it. It seemed like Ben said something under his breath. His older brother is like "what did you say?" And starts going toward him like he's going to beat him up. I never heard an utterance of "clobberin time."
I want to think they were smart enough to cut that idea out, but if not...well then the film is even worse than it already was.