Maybe I read Rem's message differently, but
A) I don't think he focused on women, he said a couple of times either sex and s/he
B) I don't think he's talking only about weight gain, but a person's attitude towards their body.
I can understand certain situations irritating someone. Let's say you are with someone who enjoys physical activity, and the two of you ride bikes, jog, play sports, etc. Then you get married, and that changes. They are content now to sit around, watch TV and snack all evening and on the weekends. Now, being a married mommy, I know your life and schedule undergoes a serious change during parts of your life. But, that doesn't really excuse you from caring enough to do something to keep in relative shape. Whether that's jogging with the baby (there are special strollers for that, but they are expensive) or simply doing crunches and jumping jacks at home, at least it's an effort.
I speak from experience. I had two babies in a two year time span (my first is in heaven) and the hormones kicked my as*. Add to that the fact that I'm an older mother, and my body just went to hell in a handbasket. BUT, the simple fact is, now that I have started working out, I am losing inches. Slowly, but surele. It seems simple, yet it's really difficult.
If someone has gained weight because of taking necessary medication, that's an entirely different matter. But if someone's mate has chosen to sit around and gain weight, and shows no concern for their own physical well being, I think it is very fair to express concern and encouragement to get them moving again. Perhaps even a little resentment that now that they have you, they don't have to work to "keep" you.
Of course, I hate my husband because he loses weight at the drop of a hat, but that's another thread.
Happyout (one chunky girl's opinion)