We will never know why so many amazing women have dated this douche ...

John Mayer is trying to shake off the heat he got for tweeting yesterday that December 13 was the "lamest day of the year" and the day just so happened to be his ex girlfriend Taylor Swift's birthday. Not cool, dude!

Soon after fans picked up the fact that the "Wonderland" singer threw some major shade at his former flame, he deleted his tweet and tried to defend himself by writing: "NOPE. No. Nuh-uh. People I am 39. I am deleting those tweets. Come right at me for doing so, Absolutely no shade." Yeah whatever you say, John Boy.

The two dated from November 2009 to February 2010, but there still seems to be some serious bad blood between the two.