Jack Osbourne brutally hit back at Pink Floyd’s Roger Waters after the musician dissed Jack’s late father, Ozzy Osbourne.

Jack called Waters a “c—t” on his Instagram Stories after Waters said he “didn’t care for” Ozzy’s music or his on-stage antics.

Waters, 81, gave his blunt opinion on Ozzy during an appearance on “The Independent Ink” last month.

“Ozzy Osbourne, who just died, bless him, in his whatever that state that he was in his whole life,” he said. “We’ll never know, we didn’t, you know? Although he was all over the TV for hundreds of years with his idiocy and nonsense.”

Waters added that he didn’t “give a f—k” about Ozzy’s music or his band.

“I don’t care about Black Sabbath, I never did,” he said. “I have no interest in biting the heads of chickens or whatever they do. I couldn’t care less, you know.”

When the host corrected him and said Ozzy actually bit the head off a bat, not a chicken, Waters quipped, “That’s even worse, isn’t it?”

Jack called Waters “pathetic and out of touch” after he got wind of the interview Tuesday.

“Hey @rogerwaters. F–k You,” he wrote. “How pathetic and out of touch you’ve become. The only way you seem to get attention these days is by vomiting out bulls—t in the press.”

“My father always thought you were a c—t — thanks for proving him right,” he continued, adding a clown emoji.

Jack followed up with a second post, added the hashtag: “#f—krogerwaters.”

Clearly, Ozzy’s children aren’t taking any insults about him lightly.

Jack’s sister Kelly Osbourne also recently defended their late father on Instagram, calling WWE star Becky Lynch a “dirtbag” after she made comments Kelly felt were “disrespectful” to Ozzy.

Ozzy died on July 22 of a heart attack. He also suffered from coronary artery disease and Parkinson’s disease. He was 76.

Jack, 39, posted a moving tribute to him last month, sharing never-before-seen photos with the iconic rocker.

“He was so many things to so many people, but I was so lucky and blessed to be apart of a very small group that got to call him ‘Dad,’” he wrote. “My heart is full of so much sadness and sorrow, but also so much love and gratitude. I got 14,501 days with that man and I know that is such a blessing.”