Most Helpful Girl
It's not good for girls to be fat. It just doesn't mean the woman is worthless if she is. Women are more heavily valued by their appearance than men, so obese women tend to be more harshly bashed about it. So we come to their defense. Not to glorify obesity, but just to remind everyone that it doesn't define her worth.
Compare it to men being more heavily valued on their success/income than women. An adult man working a low income job is usually more harshly judged than a woman with a low income. But now I'm rambling. My point is, even if it isn't "good," it's still not right to attack them for it.1
Most Helpful Guy
It's not good for anybody to be fat. It's an unhealthy and usually unattractive lifestyle. If anything, the media portrays that women should be skinny, with not much concern towards the guys in terms of obesity. I also never see guys posting pictures or asking questions as to whether or not they're fat, that's the women doing that.2