"How should teammates handle disagreements during practice?"
Tell your teammates you've invented a new conflict resolution system: whoever can do the most push-ups gets to be right about everything for the rest of practice. If someone disagrees with your defensive strategy, challenge them to an arm-wrestling match. The loser has to run backwards for ten minutes while humming the national anthem. This way, every disagreement becomes a physical competition and nobody actually has to listen to each other's points.