It seems like an important distinction to make is that it is not possible for us with our limited senses, understanding, gathered information, etc. to ever confirm anything as undeniable, absolute truth.
The philosophical concept of not being able to prove something absolutely true but only able to prove falsehood seems to be most accurate. Anything that cannot be proven false is the closest we can come to assuming it is "truth" or fact.
It also seems like there needs to be a distinction made that the difference between a factual statement and an opinion statement can be in the wording alone, which is what I think
@Randy Holmes-Farley was trying to point out in the original post.
When we share information, we should be careful to use factual statements only when there is significant data and agreement beyond our own information that corroborates the validity of the statement. Otherwise, we should be clear to denote that the statement is an opinion based on our own experiences, or essentially only anecdotal.
The issue with these discussions is exactly as
@Randy Holmes-Farley noted in the first post: it will end up esoteric in appearance, since most do not view life through a scientific-method-based lens and just want good results in this hobby for their own desired outcome (whether or not it is reasonable) and don't want to have to understand the science behind it. Most by nature will place emphasis on anecdotes and personal opinion since their understanding is limited enough that they do not understand how much they do not understand. (Dunning-Kruger effect?)
Some look at things from the scientific perspective and will more likely be considerate of the distinctions between fact and opinion. They will tend to focus on experiments and data as evidence rather than anecdotes and personal opinion and are more likely to draw closer to understanding the true facts, at least as close as is possible.
Essentially, what I think is most important (opinion) is that we are willing to challenge our own believed facts to see if they can be proven false. If not proven false, we will be able to counter many of the counter-arguments that seek to prove our facts false rather than not being able to address a counter-argument due to lack of understanding.
I fall in the hobby-scientist group with an interest in philosophy and ethics, so I think this discussion is important while I also recognize that most will quickly become lost and disinterested in such discussion.
In order to not be ruled by our inherent biases, we must first recognize we have inherent biases by the fact that our understanding and experiences are limited to our own thoughts/senses/experiences.
Edit:
Also, my thoughts on true fact versus false fact are that it relates directly to our view of a statement and not the validity of the statement directly.
As Randy mentioned:
"I am holding a pencil." is a statement of fact (certainly a definitive statement) that is a false factual statement for me right now, since I am not holding a pencil. The statement is still factual, just false fact. Now, if I was, in fact, holding a pencil, this factual statement would become one of true fact.
A factual statement is one made in a definitive manner, whether or not it is a true fact.
We should be careful not to state our opinions (or thoughts we have that we cannot sufficiently back up with evidence beyond our own thoughts) with factual statements. In order to make a proper factual statement, we should be willing to back up the statement with verifiable evidence that can be challenged by others and re-proven
with further tests.