'I don't know the ins and outs of it but it's all down to having a fallout with Michael Bay,' he was quoted as saying in the Huffington Post this week.
'But who wouldn't have a fallout with him? It's one of the most sexist things I've ever seen. She called him an assh---. Well, he is a fucking assh---. She's not the only one who has said that. Why has she been singled out?'
Fox was replaced in the Transformers sequel by Rosie Huntington-Whiteley and her unseen character became the butt of cruel jokes.
'I would never fucking watch his films,' O'Dowd continue. 'Never mind go and act in them.'
Then O'Dowd laughingly challenged Bay to meet him after school by the flag poll.