The Stranger singer was referring to Elton John's comments in a 2011 Rolling Stone interview. The Blue Moves musician talked about Joel “not writing his music anymore,” asserting that it was “either fear or laziness.” Elton felt that his fellow singer was “coasting.” He further remarked on the canceled tours and Billy needing rehab:

And So It Goes,' Billy Joel revealed there was "bad blood" after Elton John suggested he go to rehab. The second part of the doc. will premiere on Friday, July 25 at 8 p.m. ET.

Billy Joel is opening up about a tough moment with longtime friend and tourmate Elton John. In the second part of the new two-part HBO Documentary, "Billy Joel: And So It Goes," the "New York State of Mind" singer shared how John's public comments that he needed rehab strained their friendship.