Actor Freddie Prinze Jr. gave Kiefer Sutherland what E! Online calls an “epic diss,” complaining while at Comic-Con that working with Sutherland made him want to quit acting and that Sutherland was “the most unprofessional dude in the world.”

Prinze, who worked with Sutherland on “24” in 2010, said, “I did ’24.’ It was terrible. I hated every moment of it. Kiefer was the most unprofessional dude in the world. That’s not me talking trash; I’d say it to his face. Everybody that’s worked with him has said that.”

He continued, “I just wanted to quit the business after that. So, I sort of just stopped.”

Sutherland’s representative responded in a statement, saying: “Kiefer worked with Freddie Prinze, Jr. more than 5 years ago, and this is the first he has heard of Freddie’s grievances. Kiefer enjoyed working with Freddie and wishes him the best.”

Audio of Prinze’s comments also includes a few choice shots at Sutherland’s height.

Here’s the audio, posted by TMZ.com: