The 51-year-old actor admits he was mean to him after he was fired from Two and a Half Men and Ashton joined the show.
“I was stupidly mean to him because I overlooked the reality and difficulty of taking over a show,” Charlie said on the Kyle & Jackie O show (via People). “Which I did, I took over Spin City when Michael J. Fox was too sick to work, but no one ever put those two together…So, I should have been nicer.”
He added, “[Ashton] was tasked with such an uphill struggle and I was more into my own ego than I was aware of his own battle. And for that I am regretful.”
Pictured below: Ashton runs errands on Wednesday (January 25) in Studio City, Calif.