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John Mayer might not have been feeling as celebratory as Gigi Hadid and Taylor Swift Tuesday.

T.Swift turned 27 Tuesday, and the pop star received social media tributes from her BFFs, including Hadid, Austin Swift and Camila Cabello. But Swift's ex, Mayer, didn't feel the excitement. "Tuesday, December 13 may be the lamest day of the year, conceptually," Mayer reportedly tweeted.

Regretting his decision, Mayer promptly deleted the tweet. He later clarified it, saying it wasn't about Swift. "NOPE. No. Nuh-uh. People I am 39. I am deleting those tweets. Come right at me for doing so. Absolutely no shade," he wrote. He has since deleted that tweet, too.

John Mayer, Taylor Swift

Dimitrios Kambouris/Getty Images for VEVO

As fans will recall, Swift and Mayer briefly dated from November 2009 to February 2010. The breakup didn't end well, and Swift penned the song "Dear John," which included these sample lyrics: "Dear John, I see it all, now it was wrong / Don't you think 19 is too young to be played by your dark twisted games, when I loved you so?"

Mayer didn't give the song rave reviews.

"I never got an email. I never got a phone call," he told Rolling Stone. "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?"

When the magazine asked about the lyric, "Don't you think I was too young to be messed with?" Mayer responded, "I don't want to go into that."

The "Why Georgia" crooner also took issue with Swift's songwriting skills. "I will say as a songwriter that I think it's kind of cheap songwriting," he added. "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 bulls--t."