Kutcher took over the Hollywood hellraiser's leading slot on the hit comedy after Sheen fell out with creator Chuck Lorre in 2011.
However, Sheen is refusing to let his disappointment drop, and he went online on Monday to mock his successor's performance and compare Kutcher's career curve to his MTV prank show Punk'd.
He writes: "Hey Ashton sorry bro (sic) all good. Now quit barfing on my old brilliant show. Remember Punk'd? How duz it feel? (sic)."
Sheen previously slammed Kutcher in 2012, telling TMZ.com: "I'm tired of lying... I'm tired of pretending the show doesn't suck... I'm tired of pretending Ashton doesn't suck. It's nothing personal... I just feel bad for him... He's saddled with such bad writing."