Prior to today's Wimbledon final, J.K. Rowling shared a picture of herself with Serena Williams on Twitter, announcing that she was cheering on the younger Williams sister. 

Throughout her match against Garbine Muguruza and afterwards, the author of the Harry Potter series continued to rave about Serena.

Then, some idiot responded to that last tweet with this message. 

Why did he have to do that? Unfortunately for him, Rowling put him in his place. 

Game, set, match. 

Send all complaints, compliments, and tips to sportstips@complex.com

[via J.K. Rowling]