I will flatly refuse to talk to you about anything if you believe that whether or not our planet is getting hotter year over year is a matter of opinion and therefore no more significant than someone’s favorite movie.
You can have a different opinion. No one will hound you for saying… I dunno, Asteroid City was better than Across The Spiderverse. And I’d have some choice words for anyone who did. What you cannot have is alternative facts.
In practice, that’s exactly my position. Just from a very epistemologically viewpoint, my previous comment results.
Simply put, we have no way to show which is fact and which is opinion. One attempt to do that is science. But there are many "but"s with this.
It isn’t obvious which philosophy of science is “correct”. Different schools of thought exist.
Let’s assume there was only one “true” science. Even with that reduction, we still need approval (peer review), and to establish a consensus.
We have no tool or process which you could point at a fact, and then that thing says “Yup, that’s a fact!”. Or at least, we have no way to agree over which tool that should be, how it should work. Even if we disregard all political and religious squabbles.
Of course facts exist. But all you can ever perceive is your perception, and all you can ever communicate is your perspective.
To treat facts in the way you want (and me too), we need to agree what those facts are. We need to convince each other.
Of course some of these opinion-facts weigh much more heavily than others. Climate change is very much more serious than which movie someone fancies.
But fundamentally, what is the difference between fact and opinion? How can we tell them apart, without relying on opinion?