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Intelligence is an arbitrary term humans assign to stuff subjectively.

Take out the "human" and it's all just algos on a scale of complexity.

While true in general (all terms are just arbitrary terms humans assign to stuff!), usually there are underlying well-defined concepts that can be associated with common-sense language and common-sense notions. For example, a line is probably a very ancient notion, but it was made more well-defined in Euclidean geometry. I don't think intelligence is a meaningless concept, but I do think there are a number of different more or less well-defined underlying concepts or formal definitions. I tend to associate intelligence with ability to reach (potentially fuzzy) goals or satisfy certain conditions (time-continued goals), solve problems, etc.. Where I live I think there is some controversy around the term artificial intelligence because people associate intelligence with more broad cognitive activity maybe including consciousness.

In fact I think this is a particularly important distinction right now, that intelligence seems (to me somewhat unexpectedly/counterintuitively) somewhat independent from consciousness, at least as far as artificial systems go (for example, old school chess engines are much capable than humans at chess but are definitely not sentient or conscious).

People seem to miss this a lot, yet we could claim every single thing is "undefined". Even physics is undefined. There's no grand theory of everything. But we still have some really good models. Our models now are a lot better than they were 100 years ago and even more than the 100 years before that and so on.

I abhor people who make the claim that words they didn't spend the time to understand are meaningless simply because they are incomplete. It is idiocracy masquerading as intelligence. I hate it so much because the logic doesn't just fool the listener, it fools the speaker.

I'll let Asimov rant to you all instead, since half a century ago he too was frustrated with this millennia old egomaniac claims https://hermiene.net/literature/essays/relativity-of-wrong

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Agreed. Take human out and any system capable of doing an if-else is intelligent to a certain degree.
If basically everything is intelligent (e.g., incl. rather simple chemistry), does that word mean much then/is it a useful term?
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Yes, words that label parts of continua are useful, even if they don't have well defined boundaries.

Kind of amazing how simple that fact is and how many arguments are caused by people not realising that it's true.

Here are some examples: town, artery, yellow, loud, tall, kind, woman, road...

Honestly it's hard to think of words that do not exist on a continuum. The exceptions are mostly low level maths/physics things.

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Our brains are just a biological computer. And actually our bodies as a whole, and the whole life, in a sense
psychology also has favored behavioralism for a long time, such that if something displays the behavior, it is likely the same thing as that which we believe/know has the behavior already

It's come to be foundational to much of western thinking beyond psychology

A topical example is a portion of society believing that the top Ai researchers should be setting domestic political and economic policy, foreign affairs, and chem/bio weapon controls... instead of the experts in those fields. We extrapolate their above average capabilities in building Ai into an artificial general intelligence where it is not due.