A careful listener will note that the manly virtues that Jack is promoting are currently on the endangered virtues list and that the people who educate our boys will be highly inclined to disparage them.
A teacher does not want a student to be physically stronger than them and they are generally weaklings.
Courage promotes risky behavior and too often flames into defiance. Most teachers will persecute courage in a student.
Mastery is cultivated by the best teachers and discouraged by the worst, and is the one virtue not at odds with our way of raising children.
Honor, now that cannot be permitted to gain a foothold lest Johnny fails to rat out Billy for puling that prank on the shop teacher.