Viewers lashed out at Cooper, who played Navy SEAL Chris Kyle in the Clint Eastwood film, on social media for supporting Democratic presidential nominee Hillary Clinton.

American Sniper star Bradley Cooper received heat from fans on social media for attending the Democratic National Convention in Philadelphia on Wednesday.

Cooper could be seen in the audience with his girlfriend when cameras cut to show his reaction to the night's speeches.

Conservative fans who watched the actor portray Navy SEAL veteran Chris Kyle in the Clint Eastwood-directed film were quick to call out the actor for seemingly going against the right-wing values of his onscreen character and showing support for Hillary Clinton. 

"How could you POSSIBLY play the hero Chris Kyle so well and then surround yourself w/anti-Americans?" one user tweeted.

Many came to the actor's defense, while others joked about Cooper's critics not understanding that there's a difference between an actor and the person he or she portrays.

Actor Josh Gad tweeted about the backlash, "If you're that pissed about #BradleyCooper being at #DNCinPHL because of American Sniper, might I suggest imagining him as Rocket Raccoon?"

View more reactions below.

Bradley Cooper, how could you POSSIBLY play the hero Chris Kyle so well and then surround yourself w/anti-Americans? https://t.co/DQQkyW3ss8

— Mitch (@SillyLibtards) July 28, 2016

Bradley Cooper is promoting Hillary? Too bad. He's dead to me now. pic.twitter.com/gXJ4ahO8YK

— David O'Neill (@garlicfries95) July 28, 2016

I have a list of celebrities that support Socialism I refuse to spend another $ on. Add this one. Boycott them all. pic.twitter.com/uOFMkxSvRY

— Nat Shupe (@NatShupe) July 28, 2016

Bradley Cooper at DNC?! Guess I've seen my last Bradley Cooper movie. Ewww Ick

— The Real ExTex (@theRealExTex) July 28, 2016

Repubs never thought #BradleyCooper was anything but liberal. They r disappointed that his intricate study of Kyle's life taught him nothing

— Bethany Cross (@Bethcross2Cross) July 28, 2016

If you're that pissed about #BradleyCooper being at #DNCinPHL because of American Sniper, might I suggest imagining him as Rocket Raccoon?

— Josh Gad (@joshgad) July 28, 2016

People being mad at #BradleyCooper for having different political beliefs than a role he played is proof we need to invest in education.

— Dave Engler (@DaveEngler) July 28, 2016

If you're gonna boycott Bradley Cooper, do it for a good reason like the fact he isn't actually a raccoon that hangs out with a talking tree

— Cameron Young (@CameronPYoung) July 28, 2016

I can't believe republicans are mad that Bradley cooper was at the dnc like do they know he's not the real Chris Kyle

— doug dimmadome (@hotdamntifftam) July 28, 2016

I want to thank all the idiots who are upset with #BradleyCooper for being a PERSON with his own opinions and beliefs. You have made my day.

— Cannon Grant (@thatcannonguy) July 28, 2016

Republicans are sad that Bradley Cooper isn't really Chris Kyle. Nobody tell them that Sylvester Stallone didn't really beat Ivan Drago.

— Adam Murray (@Atom_Murray) July 28, 2016