“You buy into the history and the tradition, the values of the club,” said Bryan Lee, a digital brand strategist who grew up in Southern California and lives in Greenpoint. He showed up in a vintage gray Liverpool away jersey. “Historically, Liverpool has been a blue-collar port city,” added Mr. Lee, 24, as thoughtful as if he were delivering his orals at graduate school. “The politics of Liverpool was really sort of anti-Thatcher. It’s become the people’s club. Those hardworking blue-collar values never really left, even though it’s been ushered into the modern era of the club being a global franchise.”