Sean Penn and Maria Conchita Alonso in happier times: Co-starring in the 1988 movie “Colors.” (Orion Pictures)

Who among us hasn’t had a screaming fight about politics with an old friend? It happened to Sean Penn recently when he ran into former co-star Maria Conchita Alonso at the Los Angeles airport. The actress, who aired her account on WMAL-FM Monday, said she approached him to have a word about their foreign-policy differences: The actor has had friendly dealings over the years with Venezuelan President Hugo Chavez; Alonso, who grew up there, decried his regime as oppressive and corrupt in an open letter to Penn last year. As she told it, their exchange started friendly but quickly deteriorated: He called her a “pig,” she said, and she called him “a communist [expletive],” as other travelers gawked. Penn told the New York Post that he didn’t recognize Alonso as his co-star from “Colors,” the 1988 gang-war drama. “I only knew that a hostile woman was nonsensically berating me.”