Dave Portnoy vowed to “ruin” people who bought an antisemitic sign at his Barstool Sansom Street bar in Philadelphia. After a video surfaced online Sunday of bottle-service waitresses holding up an illuminated sign that read, “F–k the Jews,” the Barstool Sports founder posted a video on Instagram telling fans he was holding an “emergency press conference” about the incident. “I’ve been shaking. I’ve been so f—king mad for the last two hours,” he said. “… I’m going to make it my life’s f—king mission to ruin these people. I’m coming for your throat. I’m never ending.” 6 Dave Portnoy vowed...