John Mayer is known for spilling intimate details of his past loves, including Jessica Simpson, Jennifer Aniston and Jennifer Love Hewitt. But when the tables are turned on him, the musician is not a fan.
"As a songwriter … I think it's kind of cheap songwriting," he said. "I know she's the biggest thing in the world, and I'm not trying to sink anybody's ship, but I think it's abusing your talent to rub your hands together and go, 'Wait till he gets a load of this!' That's bull--."
Swift, 22, has never confirmed that the song - whose lyrics include, "Don't you think I was too young to be messed with?" - was about her brief fling with the rocker, but Mayer seems to think so.
"I didn't deserve it," he tells the magazine. "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."
Mayer famously gave a pair of headline-grabbing interviews in 2010 to Playboy and Rolling Stone magazines in which he revealed intimate details of his sex life with Simpson during their two-year relationship and said that he still hadn't gotten over his romance with Aniston.
He explained his thought-process at the time in an interview with NPR last month, saying he, in part, did not want to appear boring.
"There was a part of me that was dead, a certain thoughtfulness that was gone," Mayer said.
Swift's "Dear John" song, from her 2010 album "Speak Now," was released just after Mayer went on a self-imposed, two-year hiatus after his controversial interviews.
In an interview of her own at the time, Swift said the public would know who the song was about without her having to explain or make it public.
"There are things that were little nuances of the relationship, little hints," she said. "Everyone will know, so I don't really have to send out emails on this one."
Mayer confirmed to Rolling Stone that Swift was not joking on that last account.
"I never got an email. I never got a phone call," he says. "I was really caught off-guard, and it really humiliated me at a time when I'd already been dressed down. I mean, how would you feel if, at the lowest you've ever been, someone kicked you even lower?"
Mayer's interview with Rolling Stone was done to promote his new album, "Born and Raised," his first album in three years. The album debuted as the nation's bestselling album last week.