Dallas Mavericks star rookie Cooper Flagg had extremely high expectations after being the No. 1 pick of the 2025 NBA Draft. And Flagg handled these expectations flawlessly, performing on the court and proving to be worthy of his stardom with how he carried himself off the court. Winning the NBA Rookie of the Year Award is one of the most prestigious honors in all of basketball. And there was little question that Flagg would be this year's winner after the NBA regular season ended. Lo and behold, Flagg was bestowed that honor on April 27. Dallas Mavericks forward Cooper Flagg (32) | Mark J. Rebilas-Imagn Images With this stardom comes being under a microscope , especially when it comes to one's private life. And Flagg seemed to learn this lesson during his Rookie of the Year Award ceremony and press conference on April 29. At one point in his presser, Flagg was asked about his nickname of "Cooper Swagg". After saying he had never heard that, the camera panned to his parents, who were laughing.…