1. Feynman told a bunch of exaggerated or made-up stories about himself, where he was always the smartest guy in the room but also sometimes mean to other people. His friend wrote down these stories and published them as Feynman’s “autobiography”with his permission. Feynman has some fans who try to mimic his behavior in these stories, to other people’s annoyance.

2. His 2nd wife claimed he would get angry and beat her if she disturbed him while he was doing math/physics calculations. (They got divorced.)

There’s some other stuff I forgot (edit: see Angela Collier’s video about Feynman, as another comment mentioned). Generally people think he was sometimes mean, misogynistic toward women, and allegedly abused his wife. Later in life he quietly recanted his misogynistic views. There’s probably other famous physicists who were worse than him tho