Bradley Cooper returned to his native Philadelphia Wednesday night to attend the Democratic National Convention, subsequently angering some conservative fans of American Sniper, the 2014 film in which Cooper portrayed Navy SEAL Chris Kyle.

During Wednesday night's broadcast of the DNC, cameras intermittently cut to a bearded Cooper, who could be seen sitting with girlfriend and Russian model Irina Shayk. And while that seems innocuous enough, at least one segment of the Internet disagreed.

His mere presence at the DNC, combined with the fact that Cooper is a Democrat, ultimately started a whirlwind of social media comments that had Cooper as one of the biggest trending topics on Twitter Wednesday night:

Some of those blasting Cooper vowed to boycott the actor's upcoming films over his DNC attendance. Others merely were surprised that Cooper is not a Republican, as American Sniper's Chris Kyle is somewhat of a conservative hero.

Kyle, known alternately as "The Devil of Ramadi," racked up 160 confirmed kills across four tours in Iraq before he was killed in Texas in 2013. American Sniper earned Cooper an Oscar nomination for best actor in 2015.