Writer Chuck Wendig has been fired by Marvel.

In statements in a blog post and on Twitter, Wendig, who was writing for Marvel’s Shadow of Vader comic book series, as well as an unannounced Star Wars book, opened up about the firing, which he says was due to “vulgarity” and “negativity” on social media.

Wendig said, “Today I got the call. I’m fired. Because of the negativity and vulgarity that my tweets bring.”