You do realize that saying that people should try to “be within the healthy range for body fat percentage” is inherently implying that people should not be fat, right? You’re equating “healthy” with “not fat,” which is fallacious at best. You have no idea about the health of anyone, whether they are fat or thin. Someone in a body like yours can easily be unhealthy, and someone in a body like mine can be healthy. My health isn’t really anyone’s business but my own.
Additionally, there are studies that show that overweight people are less likely to die from chronic conditions, that underweight patients are more likely to die from a stroke than heavier people, that obese people are more likely to survive infections and sepsis, that patients hospitalized for pneumonia are less likely to die when overweight. You don’t know what benefits or risks someone’s body, health, or habits are presenting by just looking at them.
I’m not sure why you assume that “few women appreciate large men,” and I certainly don’t think anyone who is fat has any kind of privilege.