I hate hate hate when people try to discredit a theory because “it’s a theory not a fact” as if the label of “fact” exists on some kind of science ladder for an idea. “Facts” is a colloquial word like any other, it’s not some special category above theories.
Moreover, the most tried and tested theories are facts. Science rarely just disproves an established theory outright. Einstein’s General Relatively equations reduces into Newton’s Laws of Motion in most situations. Newton’s Laws of Motion weren’t “wrong”, it’s just General Relatively is more specific and accurate.
The Scientific Method usually just builds on what already exists without claiming we were all unfactual for working with what we had.
As a pansexual I feel that Bi and Pan have enough differences to both be justified while the others are micro labels (not invalid, just less useful as labels).
But I recognize I’m drawing that line very conveniently for myself.