Ugh, yeah, that's part of the bigger cultural issue where method acting has become synonymous with "becoming" your character, which leads to stuff like Jared Leto being an absolute asshole to his fellow cast members under the guise of truly "being" the Joker.

It's sorta like Teague's Aurora rant, where by posting Batman-with-black-armband memes you're reducing the shooting victims to Batman fans—the people who insist Ledger died because he "couldn't handle" life after the Joker are reducing his entire being and body of work to the psychotic clown he played once. It's an insult, and it enables abusive nonsense like Leto's behind-the-scenes shtick.

(I have no hopes that any aspects of Joaquin Phoenix's Joker movie will be good outside his performance, but it's so refreshing that he keeps getting annoyed when people ask him about playing the character and says it's just a paycheck like any other. Guy gets it.)