I mean theres no objectivity to the way we describe the universe anyway

You're going all in the self-delusing. If there's no objectivity, then how come we can launch shit to other planets? Why does that tech work?

A meter is more less a yard. Ever heard the term "yard-stick"? Ofc you have, and you know what it means, but you'll pretend not to.

I'll tell you that I'm klorknon gribbits tall and that is not objective, because it's just some bullshit I just made up. Like the bullshit you keep making up to not have to learn the measuring system the entire rest of the world uses.

Feets and pounds are nowadays objective, as they're based on metric standards, which have been strictly objectively defined, no matter what sophistry you want to wave around about how no measuring system is arbitrary since you don't understand it.

A second is exactly 9,192,631,770 periods of radiation corresponding to the transition between two hyperfine levels of the ground state of the cesium-133 atom.

And here's the dictionary definition for "objective".

objective

adjective

: expressing or dealing with facts or conditions as perceived without distortion by personal feelings, prejudices, or interpretations

Your "b-b-but it's a closer to human-scale scale actually much better cause cooking temps and 0 temps don't matter" is affected by your personal feelings that Fahrenheit is somehow "more human-scale", whatever the fuck that means.