you're wrong about that. boxing is all about heart, the shittalking is (mostly) just for the promotion. it's really only a few rare bad apples that take it seriously. ironically, tyson was one, he had an infamous shittalking streak and he battled to control his rage all his life. many boxing fights end in the fighters hugging in euphoria regardless of who won. it's all about proving yourself in the utmost extremes of existence and it's practically a religious experience, your opponent is not your enemy but your fellow seeker and someone who enables you to reach the zenith of that experience.
Japan