I have read the entire thread.
The OP's post was a fat attack and her own size is irrelevant because you can be both fat and self hating - in fact society encourages fat people to be self hating. It was also smug and condescending.
Fat people know that they are fat. There are plenty of people happy to point this out in words and gestures and 'just noticing' looks.
Fat people also know that society views being fat as bad. There are newspaper articles every week on the 'obesity epidemic' and endless posters, public service announcements and publications about how to eat a healthy balanced diet and take regular exercise. There are also thousands of adverts for diet pills, weight loss systems, and more newspaper articles on 'good' and 'bad' diets and changes in thinking about food science. People are bombarded with this information.
Fat people don't want to have fat children. They know from bitter experience what it's like to be vocally it silently judges and thought of as lazy, greedy or weak. They know that when people say "think of the children" they are judging the parent and thinking of their parenting as poor.
The OP is being unreasonable and naive at best to think she has contributed anything by creating this thread. She has added nothing new, nothing supportive and no new information in her posts. The only thing she has done, and it would be courteous if posters believed the people posting to say so, is make fat people who already feel bad enough feel worse about themselves.
I bloody well hope those fat people enjoying the pool had an ice cream despite OPs silent 'noticing' judgement. Although I fully anticipate being told they should have had a kale smoothie instead.