The feud between Boston Celtics' Jaylen Brown and Nike has intensified following a social media post by Nike, which praised Milwaukee Bucks star Giannis Antetokounmpo's 59-point game performance with the phrase 'Nothing childish about 'em.' This was perceived as a jab at Brown, who previously called Antetokounmpo 'a child' after a fake handshake incident during a game. Brown, who has a history of criticizing Nike for its business practices and claims it influenced his omission from Team USA, responded to Nike's post by calling out their 'weird energy.' Brown's disdain for Nike stems from past grievances, including their severance with Kyrie Irving and his own exclusion from USA Basketball's Olympic roster. The conflict is further fueled by Brown's decision to launch his own sneaker brand, 741 Performance, as an alternative to major brands like Nike.