Audio has emerged of Louis C.K. mocking the students-turned-activists from the Parkland, Fla., school shooting.

The sound-only recording was posted Sunday in a since-removed YouTube video that said it was from a Dec. 16 stand-up set at a Levittown, N.Y., comedy club. Several media outlets captured and posted clips and transcripts of the set.

"You're not interesting because you went to a high school where kids got shot," C.K. can be heard saying on the recording. "Why does that mean I have to listen to you? Why does that make you interesting? You didn't get shot, you pushed some fat kid in the way, and now I gotta listen to you talking?"

Parkland parent Fred Guttenberg replied to the C.K. material on Twitter.

"My daughter was killed in the Parkland shooting," Guttenberg said. "My son ran from the bullets. My wife and I deal with loss every day. Why don't you come to my house and try out your new pathetic jokes?"

The most prominent of the student activists from Parkland have not offered comment. A message seeking comment left on C.K.'s website wasn't immediately returned.

C.K. has recently returned to the stage after taking a break after he admitted to engaging in sexual misconduct.