In Gilman's "The Yelllow Wallpaper," what attitude does the story seem to convey about men, especially with John as an example?

Gilman characterizes John as condescending in much of the story. He does not seem to take his wife's concerns seriously at all, and ends up going back and forth between somewhat mocking her and treating her like a child. John being characterized in such a way can point to the gender dynamic in the way that mental health is viewed and thus talked about.
Certainly during the time period Gilman was writing, traditional gender roles were strongly followed. In today's day we see some moving away from that, but it's still felt. John's character displays what is a typically "masculine" approach to mental health. The myth is that men are not affected by their "emotions" as women are. This led to the idea that "hysteria" was an exclusively female problem. John ends up viewing the protagonists's deteriorating mental health as just a woman's eccentricities instead of a genuine problem.
Gilman's portrayal of John falls into line with traditional views of how men and women would handle their emotions. She is highlighting the dangers of gender roles when they are used to perpetuate myths instead of challenged and examined further.

Gilman's story seems to suggest that the masculine approach to mental health (and illness) vastly diverges from that of the feminine. The main focus of our discussion is, of course, John.
In the story, John is a physician, so his perspective about mental health is heavily based on his professional training and experience. Knowing that his wife is depressed, he prescribes her remedies that are typically accepted for the era they live in. Additionally, he is described by the protagonist as "very careful and loving," a husband who hardly lets her "stir without special direction."
John appears to be very solicitous of his wife. However, his misguided advice and sterile approach to healing exacerbates his wife's condition. For example, John has forbidden his wife to indulge her love of writing, believing that a continued fixation on her malaise would amplify her distress. However, the act of writing could have been a powerful form of catharsis and a means of healing for her.
John's approach to mental health and healing is masculine in nature. He believes that rest and "all the air" his wife can get is enough to promote healing. In other words, he believes that physical health alone will translate into mental well-being. He is partially right in his diagnosis. Where he falls short is his inability to understand that mental health is strongly connected to an enjoyment of life. Essentially, his wife had no outlet for her creative energy and, therefore, very little personal fulfillment in her life.
To help his wife, John chooses the biggest room in their vacation home as their marital bedroom. The protagonist describes the room as "big" and "airy," with "sunshine galore."
However, the protagonist soon becomes deeply distressed about the wallpaper in the bedroom. She begs her husband to tear it down, but he refuses. Instead, he tries to laugh off what he describes as her "fancies." His wife is mortified at his levity. The trust between husband and wife begins to fracture at this moment in the story. Later, the protagonist imagines that her husband does not really care about her.
The attitude of this story is that men do not share the same perspectives about mental illness and healing as women. Certainly, the difference in outlook is the main contributor of conflict in the story.