Red-faced Met Museum honchos admitted in a hastily called powwow with fuming wealthy donors that they had made a “mistake’’ in honoring convicted antisemite designer John Galliano, sources said.

During a late-afternoon Zoom meeting Monday with the esteemed art institution’s well-heeled board of trustees, CEO Max Hollein and billionaire board co-chair Tony James acknowledged gripes that the museum should have sought more input about the controversial selection, said those with knowledge of the embarrassing session to The Post.

“They admitted it was a mistake,” a source said of the one-hour meeting — which was held hours after the castigated…

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