Jerry Seinfeld, celebrity Mets fan extraordinaire, didn’t take to kindly to how Met fans behaved at the All-Star Game on Tuesday.

“This is one of the lowest moments of my lifetime of Mets fandom, when the Citi Field crowd was booing teams that they see as rivals to their Mets team,” he told Steve Somers of WFAN.

“I was in shock. I was embarrassed. I thought it was horrible manners. These are the best players, in the game you love, that have come here to put on a show for you, and we’re booing them like five-year-olds as if there’s some sort of real animosity.”

“The American League is not the Taliban,” referring to the way Miguel Cabrera was treated.

He did acknowledge that the fans may have partially atoned for their sins in how they celebrated Mariano Rivera’s tribute later in the eighth inning.

Umm…. Okay….