By Harry Davies KSI has slammed bitter rival Jake Paul after his boxing fight against Mike Tyson was announced. YouTuber-turned-boxer Paul will face ring legend Tyson on July 20 at the AT&T Stadium in Arlington, Texas. There is a massive 30-year age difference between the two men and it’s currently unclear as to whether the fight will be professionally sanctioned or will go ahead as an exhibition bout. “50+ years old. No one wanted this… So sad to see man,” KSI wrote of the fight. The social media star, who has been linked to a fight against Paul for several years, wasn’t the only name in co…