Personality and lifestyle are mainly driven by a person's upbringing actually. There is an argument to be made that if any one of the people on here had exactly the same background as Amelia we would make exactly the same choices. There is no moral high ground to be found in ripping apart a person's personal life but drawing the line at calling them fat.
Of course personality and lifestyle are driven by upbringing - but that's not all they're driven by. Two people in the same situation (same parents, same environment) can still end up radically different - have you never heard of something called free will? You seem to think people can't change their nature, when we know from countless studies and from our own life experiences that it's both nature and nurture that make up who we are and what we choose in life. Are you a clone of your parents? Are you like everyone else who grew up in your house/your neighbourhood? I know plenty of people with Amelia's background who make completely different choices and aren't as spoilt or entitled.
And you didn't call a person fat, you called a pregnant woman fat. That's delusional and we're allowed to critique that. You can say what you want and doubledown on saying a woman one week after giving birth is a fat heifer or whatever else you wanna say but you gotta be prepared to deal with the feedback and critique you get for that.
All I've learnt from your post is that you have some unhealthy views about body image and it must be embarassing to be called out about it on this forum, so I get why you won't back down. It must be quite difficult living with those kinds of standards so wish you peace, and leave it there eh.