A bevy of Twitter users mocked Sen. John Fetterman (D‑PA) for his Juneteenth post, recalling a 2013 incident in which Fetterman pursued a black jogger with a shotgun.The Pennsylvania Democrat was criticized by some for his post about the “long shadow of systemic racism” in light of an incident from 10 years ago in which Fetterman chased an unarmed black man and pointed a gun at him.The incident took place when Fetterman was still mayor of Braddock, and Fetterman claimed on WTAE television station that he had heard “assault rifle gunshots” and only used the …