Christmas is a really good example of when people willfully lack self control and gain weight as a result. Its almost seen as correct, acceptable and the done thing to gorge yourself as its a celebration. To not do so is somehow, grinchy. Result; the average Brit consumes 7000 calories on christmas day. Thats got to be something to do with a poor cultural and national relationship with food on a massive scale.
Eating socially can be a total minefield. If I go to a restaurant I HAVE to leave food. I do not find it easy at all. I could eat it all easily especially when its great food, and want to clean the plate. I think its a hard mindset to break. For me, I'm very conscious of it, as I already get "anorexic" remarks and accused of "looking like a vegetarian" whatever that is supposed to mean. I do feel guilty, judged and as if I'm being rude at times. The reason I do it, is because I have a realisation that I don't HAVE to eat everything on my plate to enjoy it just as much and that the same meals are eaten by grown men who are twice my size. This is one of the reasons that I feel some women find it particular difficult in controlling their weight. I shouldn't be eating the same as them. I don't think its an unhealthy relationship with food to do that. (plus my husband loves being my bin!). At the end of the day I feel better at the end of the night for it, as I don't feel bloated.
Another bug of mine is that when you go to McDonalds (yes I admit to liking a burger once in a while) it says on the side of a burger the recommended number of calories for a woman is 2000. For my height and weight I need 1500 daily. A Happy Meal is about 500 calories. A Quarter Pounder Meal is 1100. I can easily eat either; which should I be eating? I don't enjoy either less. But theres nothing like getting strange looks for ordering a Happy Meal when you've no kids...
I'm very aware of just how much social pressures can affect the way you eat. I really don't blame anyone and say they have a lack of control. Its not as simple as that and to suggest that is way too simplistic. And I'm far from perfect - I have eyes bigger than my stomach and get reminded by my DH at times of it. I feel lucky in that I don't have to have iron-will since I have a hungry husband who thinks its his duty to steal my food! I certainly don't think less of other people for overindulging, and I hope to god that others don't think I'm being superior or patronising in what I'm saying (its not intentioned like that). Its not about that. I couldn't give up whole food groups. I'd go nuts.
I think we could all do with changing some of our social relationships and ideas where food is concerned. I think breaking a lot of social conditioning, excessive lifestyles being encourage and the way you are trained with your manners play a massive part too. Diets are the work of the devil.
Its about everything from plate sizes, to restaurant portions, to being trained to finish your dinner, to chemicals being added to food, to high sugar content, to convenience food, to ability to cook, to understanding what a balanced diet, lack of exercise, being conned by various profiteering 'magic diets' is etc etc all conspiring together. Once upon a time, food was just something you had to survive. Now its about pleasure. Its TOTALLY different and we still have less understanding of that than we should. I really do reject the idea that we shouldn't be saying anything because of mental health issues...
I think women have things stacked up against them. But going back to the OP, feeling as if someone is being rude, when they are simply trying to point out risks and offering help isn't an attack necessarily an someone or trying to make anyone feel bad or guilty about it. It needs to be done, to focus attention. I'm not sure there is ever an ideal way to break the "it won't happen to me" mentality, until its too late. I don't think its possible to 'get it right' for everyone as there will always be someone who gets knickers in a twist over it. You can be over sensitive too.
Perhaps I don't have an idea of how hard it is to loose weight; but I DO have a good idea of how hard it is to stop gaining it, within a modern day culture when everything is designed for people much bigger than myself. I don't go round looking at women going "fatty" or pitying them, I'm not the enemy, and I wish that other women wouldn't see me as such. Tact and understanding can be very hard to achieve in both directions.