JK Rowling has once again proven why she shouldn't be messed with on Twitter, this time taking down the Westboro Baptist Church.

On Saturday (May 23), the Harry Potter author celebrated Ireland's vote to back gay marriage, responding to one fan who joked about her character Albus Dumbledore marrying Lord of the Rings wizard Gandalf.

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The controversial church wasted no time in reacting to the result of the Irish referendum, and appeared further enraged by Rowling's tweet.

"So @jk_rowling wants Dumbledore & Gandalf to marry in Ireland; if it happens, WBC will picket! #NotBanned," they wrote on Twitter, with a campaign image featuring homophobic language attached.

.@WBCsigns Alas, the sheer awesomeness of such a union in such a place would blow your tiny bigoted minds out of your thick sloping skulls. â€” J.K. Rowling (@jk_rowling) May 26, 2015

Hitting back, the author wrote: "Alas, the sheer awesomeness of such a union in such a place would blow your tiny bigoted minds out of your thick sloping skulls."

The Westboro Baptist Church are long-time vocal opponents to homosexuality and have also previously claimed that wars in Iraq and Afghanistan are punishments from God.