Taylor Swift has, fairly or unfairly, garnered a reputation for writing songs about her ex-boyfriends.

One of them is musician John Mayer, whom she dated briefly in late 2009/early 2010 and who allegedly inspired her track 'Dear John', with lyrics like: "Dear John, I see it all now that you're gone / Don't you think I was too young to be messed with? / The girl in the dress cried the whole way home / I should've known."

Now, Mayer has come out and slammed his former flame in a new interview with Rolling Stone, saying: "It made me feel terrible, because I didn’t deserve it. I’m pretty good at taking accountability now, and I never did anything to deserve that. It was a really lousy thing for her to do… it’s abusing your talent to rub your hands together and go, ‘wait till he gets a load of this!'”

Mayer went one step further and passive-aggressively tweeted on Swift's birthday the other day, saying (in now-deleted tweets): "Tuesday, December 13 may be the lamest day of the year, conceptually".

When people called him out on it, he cheekily replied: