Mike Bloomberg bashed Bernie Sanders on Monday for boycotting the annual pro-Israel AIPAC conference — accusing the Vermont senator of being “dead wrong” when he called the gathering racist.

The billionaire ex-Big Apple mayor was the only 2020 Democratic hopeful to attend the annual event, using his speech to skewer Sanders’ claims that the conference was a platform for “bigotry.”

Both men are Jewish, but they have divergent views of the American Israel Public Affairs Committee, which advocates pro-Israel policies to Congress.

“Sen. Sanders has spent 30 years boycotting this event. As you’ve heard by now, he called AIPAC a racist platform. Well, he’s dead wrong,” Bloomberg told the giant crowd gathered in Washington, DC. “This is a gathering of 20,000 Israel supporters of every religious denomination, ethnicity, faith, color, sexual identity, and political party.”

“Calling it a racist platform is an attempt to discredit those voices, intimidate people from coming here, and weakens the US-Israel relationship,” he said.

Sanders declared war with AIPAC last week when he blasted the annual conference, claiming it provides a platform “for leaders who express bigotry and oppose basic Palestinian rights.”

Bloomberg is competing on the ballot for the first time in Super Tuesday primary states, but spent the morning before the contest in Washington, instead of on the campaign trail.

He said he would be unequivocal in his support of Israel, an issue that has rankled Democratic candidates this year.

Both Sen. Amy Klobuchar of Minnesota and ex-South Bend, Ind., Mayor Pete Buttigieg flip-flopped on their decision to skip the conference — with Klobuchar eventually appearing via video on Sunday.

The bipartisan event frequented by both Republicans and Democrats was once an unmissable stop for presidential candidates, but has been boycotted by Democrats in recent years as progressives in the party, including Rep. Ilhan Omar (D-Minn.), have accused it of being too right-wing.

“The reality is: AIPAC doesn’t fuel hatred. AIPAC works to combat it — and the violence that it can produce. And if more elected officials spoke to the people here, they’d understand that,” Bloomberg said Monday.

Last year, Mayor Bill de Blasio was forced to defend his visit as a then-presidential wannabe, telling the crowd he thought it was a “mistake” for other candidates to skip the event.