Taylor Swift is no fan of Justin Bieber.

Selena Gomez’s on-again, off-again relationship with Beiber is causing tension in her friendship with Taylor.

A quoted source claims, “Taylor hates him. She thinks Selena makes a mistake every time she reconciles with him. Bieber has really come between the girls.”

And it seems the feeling may be mutual with Justin, who reportedly “complains Taylor’s always telling Selena she can do better.”

Taylor dodged questions about Justin at the Billboard Music Awards back in May.

Taylor also didn’t attend Selena’s recent 21st birthday party, which Bieber did go to, but a rep for her insists her and Selena are “great friends who talk almost daily.”