Unfortunately there are many subjects where all the facts aren't known, therefore opinions must be discussed to advance the understanding and ultimately help to establish future facts. Also, one person's believed facts may be a misunderstanding, for example, hence why discussions and arguments may happen.
I don’t subscribe to the notion of opinion being equated to hypothesis.
I also don’t believe in facts. A fact simply is.
Opinions are held beliefs that are usually founded in how a person feels about a subject. I see no reason in respecting a belief. I can respect a person, when earned. But their opinions and beliefs are not anything I require to be respected. And I expect nothing less toward myself.
It’s also why I tend to extricate myself from any argument people like to have. Because my experience has taught me that most people have no idea of what they speak, and when proven wrong in the face of objective fact, they double down on their beliefs.
So I reiterate — there is no point without objective fact and evidence.
I certainly agree that a fact simply is, noting your lack of belief, however communication is only possible through description so I suspect some somantics here. My point was that within an arguement, opinions can be extrapolated from known facts to suggest unkown/unproven facts, if only so to the individuals involved. Essentially this is that basis of any argument - to exchange ideas/possibilities etc to reach the ultimate goal of determining what is a fact.
Though, as you say, many discussions and arguments, especially in a casual scenario, are taken as exercises in 'winning' rather than with the aforementioned aim. I agree this is frustrating and understand your stance.
Re respect. If you respect a person (your approach being much the same as my own), does that not preculde that you respect what they say?, at least in most instances, even if they are mistaken or incorrect? Though I think there may be two points here, one re emotional beliefs & one re fact-based beliefs. The latter being more what I've been refering to. Emotional beliefs are much closer to pure opinion than facts.