Sacha Baron Cohenfired back at claims made by former costar Rebel Wilson that he acted like a “massive a——” while filming the R-rated comedy flick The Brothers Grimsby, alleging her narrative of the events is inaccurate, RadarOnline.com has learned. The film was released in March 2016, in which Wilson portrayed the wife of his character Nobby, who reunites with his long-lost secret agent brother (Mark Strong) after he became privy to a sinister plot. The two team up to help to save the world and prove Strong’s innocence. Earlier this month, The Pitch Perfect actress teased that she now has…