He said it himself.
TMZ was at Stereo's second birthday party last night, where our absolute favorite singer-songwriter revealed exclusively to us that he's been engaged in thorough Internet-based self-investigation, and his findings? "I'm kind of a douchebag. I got a little sick of myself ... I'm insufferable," said John. Inside wants out!
Mayer then issued a formal apology to the Internet world. Other douchebags could not immediately be reached for comment.