Leftist filmmaker Michael Moore is not a fan of “American Sniper.”

The biopic of Navy SEAL Chris Kyle directed by Clint Eastwood and staring Bradley Cooper is setting box office records, and the “Sicko” director is not too happy about that.

Taking to his Twitter account, Moore wrote, “My uncle killed by sniper in WW2. We were taught snipers were cowards. Will shoot u in the back. Snipers aren’t heroes. And invaders r worse.”

My uncle killed by sniper in WW2. We were taught snipers were cowards. Will shoot u in the back. Snipers aren’t heroes. And invaders r worse — Michael Moore (@MMFlint) January 18, 2015

Kyle, the most lethal sniper in military history, saved countless lives of American soldiers in his four tours of duty in Iraq. He was killed in February 2013 by a fellow soldier he was trying to help who was suffering from severe post-traumatic stress.

Moore is a well-known Hollywood progressive who advocates for socialism and “economic justice.” Moore has a history of attacking the military, corporations and the wealthy while embracing totalitarian regimes around the world, including Cuba. While he’s never been in the military, he and his company have made tens of millions of dollars through his films.

His recent divorce exposed his lavish lifestyle, including a huge mansion in Traverse City, Mich., which exposed him to charges of hypocrisy.

Moore came to fame and fortune for his 1989 movie “Roger & Me,” in which he pursued General Motors CEO Roger Smith for an interview about GM’s impact on Flint, Mich. In the movie, Moore speaks with Smith at a shareholder’s meeting. However, in reality, Moore actually had two sit-down interviews with Smith but decided not to use it, giving the impression that Smith and GM were running from Moore’s team.