I don't see this as a ME specific issue in medicine, but an issue with medicine as a field unable to cope with not having the answers. I definitiely put the responsibility at the feet of health care professionals and not patients. Yes, patient organisations should not put out misinformation, but there is quite a lot of it coming from the healthcare sector and expecting (mostly) lay persons to stand up against doctors/researchers with years of experience is not fair. And the power dynamic is squarely in favor of the doctor/researchers.
Should we stop helping people with food allergies since there are masses upon masses of social media influencers who talk about different exclusion diets? No. And if someone comes to me and tells me they have an allergy, I will simply ask if it is in fact an allergy and not say an intolerance - it's not hard to ask why they use specific terms/phrases. They might even have been told by a doctor to avoid a specific food - and then other doctors will make fun of them for "believing whatever they read online".
I'm more worried about the harm doctors do when they don't know what they are talking about. I've met doctors who mistake food intolerances for allergies, but for some reason I am not allowed to make fun of them, but it is somehow accepted to do so if it's a patient making the mistake. It is a culture problem.
Vaccination would be another example. There is astonishing misinformation going around about vaccines, people promulgating the weirdest ideas, but this hasn't led to medics deciding to give up vaccinating anyone - because they are confident that what they have to offer is better than what the lunatic fringe is offering.