As three masked young men Sieg heil–ed across the street, Jake Lang spoke softly into a cellphone, listing off Black crime stats to a grieving father he hoped to recruit to his cause. On the other side of the line, Jeff Metcalf exhaled and paused to collect his thoughts. “Okay, my turn to speak,” he said sternly, as a small crowd listened. “You are part of the f—ing problem, my friend. You’re trying to create more race divide. I do not condone anything you do. . . . You do not have any f—ing—”Lang quickly interjected. “That’s called white guilt,” he said. “You’re creating more Austin Metcalfs with your weakness, sir,” he said, referring to the white Frisco teen who was killed April 2 by a Black high…