Well, he's got about as much proof as Bill Cosby that he didn't do it...

I never liked him. It's kinda funny, all of the people I disliked turned out to be rapists.

Here's a credible source: https://www.avclub.com/stan-lee-denies-report-claiming-he-sexually-harassed-nu-1821921296

Earlier today, a report was published in (ugh) The Daily Mail claiming to have an exclusive scoop on former Marvel editor-in-chief Stan Lee, the essence of which is that Lee, according to an anonymous source, habitually sexually harassed nurses who worked with him at his Los Angeles home. Groping them, walking around naked, making crude jokes, propositioning them while he was in the shower, the whole thing. This is all tied to an also anonymous nursing company, whose rep tells the tabloid—whose homepage currently features several links promising topless shots of famous women—that the company received several complaints about the 95-year-old, including one from the company’s owner, before ending its business relationship with him last year.

Meanwhile, a rep for Vitale Nursing Inc., which is currently working with Lee, says they have received zero complaints about him, calling him “polite, kind, and respectful.” Lee’s attorney Tom Lallas has sent a cease and desist letter to the anonymous nursing company, which Lallas argues has not filed a police report or civil action against Lee as a result of the reported harassment, but instead has repeatedly demanded money. The Daily Mail story, he says, is the result of his and his client’s refusal to pay. “Mr. Lee categorically denies these false and despicable allegations and he fully intends to fight to protect his stellar good name and impeccable character,” he says in a statement.