It's not clear what the fans were saying to Sen, but their words were enough to prevent him from completing the game. After waving off the consolations of both his teammates and opponents, Sen left the pitch and was replaced by another player.
“Swearing at players is unacceptable. It is impossible for us to accept such a thing, but it [walking off the pitch] was not becoming of a professional football player,” he said, calling the act childish.
Hey man, the guy had a rough night. No need to be a dick.