John F. Kennedy’s outspoken grandson Jack Schlossberg is gladly taking on more personas as he publicly criticizes cousin and presidential candidate Robert F. Kennedy Jr. Sharing a series of Instagram clips, the 31-year-old got into character as a number of would-be voters, mocking RFK Jr. while revealing why he feels the 2024 hopeful is not fit to lead the country, RadarOnline.com has learned. In his latest clip, Schlossberg did his version of a Cockney accent in a character he named Tiny Tim, who called out RFK Jr. for his anti-vaccine stance supporting “bodily autonomy” before pondering why …