J.K. Rowling
J.K. Rowling got fed up with a Twitter user who tweeted something mean against “Fantastic Beasts: The Crimes of Grindelwald” director David Yates. In this photo, the author arrives at a gala performance of the play “Harry Potter and the Cursed Child” in London on July 30, 2016. Reuters/Neil Hall

A lot of people were unhappy after famed author J.K. Rowling defended the casting of Johnny Depp as Gellert Grindelwald in “Fantastic Beasts: The Crimes of Grindelwald.”

Netizens flooded Twitter with unhappy comments, which Rowling kept silent to. However, there was one comment she was especially unhappy about - so much so that she decided to block the Twitter user.

“I have one simple rule when I block people on Twitter, which I do very rarely. I block when my personal line has been crossed in terms of aggressive or insulting language,” Rowling explained on her website.

“Some recent publicity was given to the fact that I blocked a fan on Twitter. Contrary to the fan in question’s assertion, they were not blocked because they asked a question about Johnny Depp playing Grindelwald,” she added.

Rowling added she saw the tweets by chance, and what was written “crossed the line of what I’m prepared to accept.” She continued to clarify, “The question about Grindelwald was not one of those tweets and I didn’t see it until the person in question began claiming that that was why they had been blocked.

The blocked fan, who goes by the name Lindsey on Twitter, told INSIDER that the offensive message Rowling was probably referring to was the one where she said Yates “can choke” after saying Depp is a kind person.

“I’m still very much disappointed,” Lindsey said. “She has fought God knows how many people on Twitter. She has challenged people to an argument who has said far worse things. But an actual fan who tagged her in one tweet [that] was quite polite, she blocks. That says more about her than me.”

Fans were frustrated that Depp - someone who was accused by his ex-wife, Amber Heard, of domestic abuse - was given the chance to participate in the “Harry Potter” spin-off movies. Many threatened to boycott the film because of Depp’s involvement, but there were still a few who rallied behind Rowling.

For her part, Heard even posted on Instagram that not everybody understands the whole picture, so she encouraged people “to pick and choose certain lines and quote them out of context.”

“Fantastic Beasts: The Crimes of Grindelwald” will be released on Nov. 16, 2018.