This one is a personal pet peeve of mine. Prescritivism > descriptivism, makes sense. But then people, just, refuse to agree on meaning, while pretending they're all thinking of the same thing. And that's not how any of this works.
And the reason this annoys me in particular: it's clear that we would agree a lot more, a lot more often, across different aisles of the ideological spectrum, if we could get to speak in the same terms without giving away any collective bias upfront. But most people don't seem to do that, they stick to their own definitions and then feel the need to defend themselves against this evil strawman at the other side, that is probably doing about as well and is about as much of a violent kind of folk as themselves.
We need to stick to something and coordinate. Maybe not, like, universal definitions (academic or from everyday use) that cannot be violated in any way whatsoever. But at least to know that we're on the same page when we're talking to someone.