The dozens of allegations against the former movie-making titan played a major role in sparking a worldwide social movement against sexual harassment and violence in the workplace.
He wasn't surprised by the allegations, McCarten said.
"I was very wary of the guy because the stories were so ghastly about his bullying."
Weinstein was someone who if he entered your life as a young, independent filmmaker, could have a huge influence by providing funding, such as he had done for Sir Peter Jackson and Dame Fran Walsh.
McCarten stayed off Weinstein's radar for years before the phone began to ring. But the Kiwi rejected overtures of lunches and other meetings.
"I just found him a complete creep."
However, McCarten said he believed the social movement sparked by the allegations would fade.
All movements had their moment and lasting change would take a long time.
However, the publicity around potential abusers would make them think twice before taking advantage.
"That's a damn good thing."