On Sunday, J.K. Rowling, the British author best known for writing the "Harry Potter" book series, fired back at a homophobic Twitter user that expressed his opposition towards a homosexual "Harry Potter " character.

"Once u revealed Dumbledore was homosexual I stopped being a fan," the homophobic Twitter user, Frank Fraticelli, wrote online. "Nice how u blindsided us with that one. Enjoy your billion $."

E! News reports that Fraticelli's Twitter account has since been deleted.

Prior to Fraticelli deleting his account, Rowling responded with her own pointed tweet referencing Stagecoach founder Brian Souter.

"I advise you to start following Brian Souter at once. He's much more your kind of person," she tweeted in response.

According to E! News, Souter funded a campaign "to maintain a teaching ban in schools regarding the acceptance of homosexuality."

Rowling first introduced the "HP" character Dumbledore as gay during an audience Q&A in 2007, People reports.

When a member of the audience asked Rowling if Dumbledore had ever been in love, the bestselling author responded, "I always thought of Dumble as gay. Dumbledore fell in love with Grindelwald, and that added to his horror when Grindelwald showed himself to be what he was."

Rowling later added, "I was in a script read-through for the sixth film, and they had Dumbledore saying a line to Harry early in the script saying he knew a girl once, [and] I had to write a little note in the margin and slide it along to the scriptwriter: 'Dumbledore's gay!'" Following her tweet to Fraticelli, Rowling then tweeted a thankful message to her supporters. "I want to thank all the people tweeting me lovely messages. Don't worry about me - to paraphrase Albus Dumbledore. If you're waiting for universal popularity, you'll be on Twitter a VERY long time. Xxxx," she wrote to her fans and supporters.