For those interacting over the internet, they have a choice what they read, whom they agree with and how they deal with unpalatable messages. The Report button exists to allow a fresh set of eyes to read any given contribution to assess fair play and rigour.
I can't think how, interacting over the internet anyone can e forced to do anything they don't want to. All they have to do is step away from the keyboard, or seek information elsewhere.
Poetry exists as a form specifically because it generates an emotional response. People experience racism, homophobia, anti-semitism etc. because people cannot help having emotions. Grooming, abusive relationships, coercion are all problems for this very reason.
It is very easy to say "they are just words ignore them," but that is no different than saying the cure for depression is being told to cheer up. We are all very different, and if you are able to dismiss what people say without ever experience a negative emotional reaction then you are fortunate. But you are in a minority.
When someone is newly diagnosed and comes here for help they will be feeling vulnerable. They have just found out that have a serious condition, possibly thinking it means they have done something wrong in how they live their life, but most likely think they will need to make changes in how they behave for the rest of it.
They will also lack the knowledge and experience to know what is good or bad advice, that is why they ask questions. They will not know when to listen or when to walk away. Tell them it is their own fault and they may agree, because how else did they end up in this situation? And you seem to be knowledgable and experienced with diabetes that you are here offering advice. That is why they are here, to seek help from such people. So if they say you need to go on an extreme diet, give the impression your life is at risk if you eat the wrong thing, then why would you not believe that and act on it. Potentially to the extent of an eating disorder as Kaylz said.
Words matter, they have power, especially when people are in vulnerable and emotional states. Many of the worst figures in modern history do not gain power through might but rhetoric, exploiting normal human behaviour. "Sticks and stones" may be a useful mantra to say to yourself to help control that emotional response, but it is not descriptive. It is psychologically nonsense.
The reason why I just come and go with this forum now is that a long time ago I realized that the best thing way for me to cope with uncomfortable situations was to leave them. I am not very good at fighting and it is often not worth the effort, o why subject myself to that? Although even then I need to reach a point where I fully understand the situation to know that is what I need to do.
But that is me. And you are you. And other people and different also. You might not be able to think how other people cannot just dismiss something and walk away from the keyboard. I cannot think how people can possibly like peanut butter, watch reality TV, or speak Chinese. But I accept they do. A lot of them do. Weird.
Sorry if that is too strong, but this is something which especially annoys me. Practically dismissing other people's different experiences and treating them like they are weak or broken because they are more sensitive in their emotional responses. It is the same kind of damaging behaviour being discussed regarding pushing dangerous diets. Some people may go away thinking that if you do not respond emotionally to words that there is something wrong with them because they do. And instead of eating disorders it can lead to other psychologically dangerous behaviour.