Michael Savage, the incendiary radio host who last week characterized nearly every child with autism as “a brat who hasn’t been told to cut the act out,” said in a telephone interview on Monday that he stood by his remarks and had no intention of apologizing to those advocates and parents who have called for his firing over the matter.

“My main point remains true,” Mr. Savage, whose radio audience ranks in size behind only those of Rush Limbaugh and Sean Hannity, said in the interview. “It is an overdiagnosed medical condition. In my readings, there is no definitive medical diagnosis for autism.”

On the July 16 installment of his program, which is broadcast every weekday, Mr. Savage suggested that “99 percent of the cases” of autism were a result of lax parenting. He told his audience: “They don’t have a father around to tell them, ‘Don’t act like a moron. You’ll get nowhere in life.’ ” Among the other admonitions he felt children with autism should be hearing, he said, were: “ ‘Straighten up. Act like a man. Don’t sit there crying and screaming, idiot.’ ”

Asked Monday if he actually believed that 99 out of every 100 cases of autism were misdiagnosed, Mr. Savage conceded that figure was “a little high.” He added, “It was hyperbole.”