ATLANTA — Mitchell Robinson’s usage has been perplexing – especially to those close to him.  He only played 11 minutes in the Knicks’ 109-108 Game 3 loss to the Hawks Thursday night at State Farm Arena.  His longtime trainer, Marcell Scott, criticized his lack of action.  Mitchell Robinson of the New York Knicks dunks the ball against the Atlanta Hawks. NBAE via Getty Images “Knicks Coach Mike Brown is SCARED to get mad!!!” he posted on his Instagram Story on Friday. “He’s to [sic] nice of a guy to coach the New York Knicks!!! He would rather play OG [Anunoby] at the 5, instead of [Karl-Anthony Towns] and Mitch at the 4 and 5. Nice guys finish last Coach!”  It’s certainly not the first time Scott, who often posts videos of Robinson training with him over offseasons – has spoken out about how the Knicks utilize Robinson. In December, he posted a caption that said, “Include him in the offense, he will make free throws!” on his Instagram Story.…