It may not be that type of forum, but if a lot of bullshit posts go unchallenged it begins to feed the "popular opinion" myths that float around the diet and fitness industries posing as facts, because it is seen sooo often.
there are plenty of so called common knowledge facts which are simply wrong, and it is hard to fight against these sorts of beliefs even with science.
It does not help when diet science is so complex and varied, that almost any crackpot idea can find some sort of study to back it up, usually studies which are not peer reviewed and or are funded by a special interest group paying for the results to fall in their favour. Studies done by companies on their own products also fall into this category which is very common in the diet supplement industry. Statistically insignificant results can and do get blown out of proportion and become the next big thing.
A sample size of n=1 is not a great basis for saying something will work for everybody, especially in weight loss, where a person may be changing a heap of variables at once then they come onto a forum like this to tell everybody they found the secret to weight loss.
I am confident in the science that backs my way of eating, but as most people here who get to know me, I will not and do not push for everybody to eat that way because not every individual will respond the same way.