https://www.thewrap.com/bruce-lee-daughter-mockery-once-upon-a-time-in-hollywood-shannon-lee/ (Note that there are descriptive Plot Spoilers in the second paragraph of the article in the link for those who haven't yet seen, but still want to see, a film by a long-known abusive racist piece of shit. They're not included in this post for that reason)
Bruce Lee biographer Matthew Polly commented further on the matter in a podcast linked in the article:
"I understand they want to make the Brad Pitt character this super bad-ass who could beat up Bruce Lee," Lee told TheWrap. "But they didn't need to treat him in the way that white Hollywood did when he was alive."
"It was really uncomfortable to sit in the theater and listen to people laugh at my father," Lee added. "He's the one with all the puffery and he's the one challenging Brad Pitt. Which is not how he was."
"What I'm interested in is raising the consciousness of who Bruce Lee was as a human being and how he lived his life," she added. "All of that was flushed down the toilet in this portrayal, and made my father into this arrogant punching bag."
She said she understood that many characters in the film are caricatures, but noted that the film didn't make fun of Steve McQueen, who is played by Damian Lewis.
She said she didn't take issue, however, with Moh, the serious Bruce Lee fan who plays him in the film. She said he did a good job with some of her father's mannerisms, and his voice.
"But I think he was directed to be a caricature," Shannon Lee said.
Bruce Lee biographer Matthew Polly commented further on the matter in a podcast linked in the article:
Given how sympathetic Tarantino's portrayal of Steve McQueen, Jay Sebring, and Sharon Tate is, I'm surprised he didn't afford the same courtesy to Lee, the only non-white character in the film. He could have achieved the same effect–using Bruce to make Brad Pitt's character look tough–without the mockery.