If you haven't heard, he was fired by Disney for some stupid and extremely bad jokes he had on Twitter over a decade ago, before he even worked for Disney. This seems utterly unfair as he didn't do anything with his time at Disney and Disney had to have known of his earlier gross work that was at Troma with gross-out and sex humor. This is the same man who from Troma made live action Scooby-Doo movies, so Disney is acting very strange. Out of fear that they could be tied to his tweets before he worked for them they axed him, which is crazy.
And James Gunn himself has even apologized for those tweets, but they were just stupid comments and him trying to be edgy and were just jokes.