In case anyone had doubts, John Mayer just made it pretty clear there is still bad blood between him and ex-girlfriend Taylor Swift.

During an Instagram live-stream with Shawn Mendes this Sunday, November 17, Mayer, 42, took a dig at Swift, 29, by commenting on her song “Lover,” of which she just made a remake in collaboration with Mendes, 21

Joe Alwyn.

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RadarOnline.com readers recall Swift and Mayer’s romance began around March 2009, when the singers shocked fans by collaborating on Mayer’s song “Half of My Heart,” and later performing a series of duets at various live shows. At the time, Swift was 19, and Mayer was 32. It’s unclear how their relationship plummeted after their very-public debut, but in December of that year, Swift released the emotional breakup song “Dear John,” about the alleged Hollywood playboy.

Responding to the song, Mayer told Rolling Stone in 2012 “I was really caught off-guard, and it really humiliated me.” He added that in his mind, what Swift did to him was “cheap song writing.”

In 2013 Mayer released his song “Paper Doll,” which, though he never confirmed, fans believe is about Swift. The music video also features a delicate-looking woman and seems to be a dig at Swift’s apparent fragility.