How do you make sure you understood the idea if the word choice is incorrect? You may assume from context what the idea was, but you may as well assume wrong. And the more such assumptions exist in one dialogue, the further it is from information exchange, and the closer it is to not listening at all because you already knew the context before the dialogue

I believe that's a terribly slippery slope there: truth lies not only in the artist who made something but also the beholder who receives it. It's both. If I sent you an unasked-for picture, say of my genitals, then my own preferences in the matter may be said to matter less than those of the recipient even!

Or I could say e.g.: that men and women are the same thing (I mean... 22 other chromosomes are so...), or that men and bears are the same - neither is particularly true, nor does me saying it help make it so. The burden is on me to communicate whatever I intended - men and women are similar, and indeed the same in so many aspects, though not precisely all; and similarly with men and bears.

I preemptively agree that the importance of saying that mammals is the same thing as animals is low. Unless, that is, someone has decided to really really really really really care about the answer, for whatever reason, and then to them it will matter. But how then will they find the answer in such case, when everywhere they look, people all agree that those words mean the same thing?

You seem to be arguing that mammals == animals is a matter of subjective opinion, like the sky is beautiful, rather than of fact, like the sky is green, or blue, or whatever the names of colors mean. It is not though?

Oh well, no biggie. But I do think that facts matter, and furthermore I think that the very existence of the USA is at stake upon this issue. Not that I have anything against you personally I hope you understand (my intent there only going partway to explaining that, and the burden to communicate such being partway on me to say whatever I mean), it's just that I get triggered upon this matter, as I wonder how many of my family members will be among those who get killed as a result.

Anyway, far from ignoring that "truth", I was in fact bemoaning (and also making fun of:-P) its existence. Not every popular trend is equally valid. Case in point, I was making fun of the existence of the former, which you took exception to, so apparently you agree that despite the fact that MANY people think that mammals==animals, that there should be other interpretations that are equally valid and my pointing out the opposite was something that you felt needed to be spoken out against. If only there was some way to arbitrate! Some way to find out which things were "true", vs. "untrue"! Sadly, there is not it seems, so in your mind you will remain "correct" and in mine I will do the same. No /s - I truly bemoan that fact, but I know of no way to remedy it: in my worldview, facts, and only facts, are true, regardless of how many people believe otherwise.