what does the narrator mean when she says, john is practical in the extreme?

John is a practical physician who believes that his wife is suffering from nothing more than a “slight hysterical tendency.” He prescribes the “rest cure,” confining the narrator to the nursery and forbidding her to exercise her creative imagination in any way. His antagonism toward her imagination stems from his own rationality and personal anxiety about creativity; he scoffs openly at the narrator’s fancies and is incapable of understanding her true nature. Throughout the story, he treats her in an infantile manner, referring to her as his “blessed little goose” and “little girl.” He really is an extension of the "practical" old boy's club mentality so prevalent at the time.