By Jamie Spencer Manchester United forward Marcus Rashford has powerfully hit out at his detractors, suggesting that a “line has been crossed” in the way that criticism towards him, ultimately questioning his commitment and dedication as a professional, has been framed. Writing for The Players’ Tribune, part of 90min’s parent company Minute Media, Rashford described himself as an “introvert” who doesn’t normally like to respond. He even said he isn’t trying to “have a go at the media” but explained the reports about him in recent months have been more about a public character named ‘Marcus Ras…