After an early playoff exit, the Celtics find themselves on the cusp of a critical offseason filled with important decisions about their roster —as well as drama surrounding one potentially disgruntled star in particular. Jaylen Brown has made NBA headlines recently for his comments in the wake of Boston’s first-round series loss to the 76ers. Brown took a pointed shot at Philly big man Joel Embiid for “flopping” in Game 7 and then went on a weird livestream during which he claimed some of the league’s referees had an “agenda” against him . “If you’re going to call push-offs, call that,” Brown said. “Same move. Same refs. Oh, it’s nothing? It’s play on, right? But you gonna call me? Everybody does it ... but if it would have been me, it'd have been an offensive foul. Every good basketball player does this. What are y’all talking about?…