Typically, when a manager, boss, leader, or heck any stakeholder wants something to happen a certain way, he or she communicates that in advance. Otherwise -- shocker -- it never unfolds that way.
LaRussa can get blue in the face all he wants. Neither he nor any player in the dugout communicated to this player what the plan was.
Rules, laws, norms, mores, whatever you want to call them, need to be communicated, whether the "rules" are written or unwritten. Especially so in a dugout, where the players have vastly different experiences, histories, and viewpoints.
I don't blame this kid for not getting the memo that was never sent. We all know what people say about the word "assume."