BILLY'S BOOZY WAYS PICKLED ELTON BOND

Still smarting from Rocket Man's zingers

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REFORMED boozehound Billy Joel is singing that his battle with the bottle poured “bad blood” on his friendship with former tour partner Elton John.

In Billy Joel: And So It Goes — a no-holds-barred documentary about the hitmaker’s life now airing on HBO Max — the Piano Man, 76, recalls how Elton, 78, blasted him in a 2011 Rolling Stone interview for canceling shows on their Face 2 Face tours nearly a decade earlier because of “alcoholism.”

Recovering addict Elton also griped that Billy went to cushy “rehab light” — rather than seriously dealing with his “demons” — and was “coasting” on his old hits.