The 52-year-old actor claimed as much in an interview Monday on The Howard Stern Show. Stamos will reprise Uncle Jesse on the Full House sequel series, but upset the 29-year-old designers by not contacting them about the new show.
"I think there was some confusion," the star said. "They said first I didn't ask them. And I didn't personally, but I was told they were asked. So I had a knee-jerk reaction and said, 'Bull[expletive], I did ask them.' And they got upset, so I did call and talked to Mary-Kate."
"They were very, very sweet," he said of the Olsen twins' refusal. "They seemed very into it. They just were afraid of acting. They don't consider themselves actresses ... They were like, 'Let us think about it,' and it just wasn't for them."
Executive producer Robert L. Boyett said the Olsen twins are "still very much considered family" when he announced the pair won't reprise Michelle Tanner in May. Mary-Kate Olsen told Women's Wear Daily at the time she was "shocked" Stamos didn't contact them about the show.
Bob Saget, Lori Loughlin and Candace Cameron Bure are among the other stars who will return on Fuller House on Feb. 26. The series will focus on an older version of Bure's character, D.J. Tanner, as she raises her own children.
Stamos also discussed his June D.U.I. with Stern, saying he "hated" himself for being so "stupid" and "ignorant." The actor was sentenced to three years probation and a three-month alcohol abuse program for the crime in November.