A lot of people seem to view ableism as just not saying certain words, and this is tremendously over-simplified.
Ableism won't be stopped by climbing the euphemism treadmill and searching for "replacement words". Just like calling someone an "idiot" isn't really an improvement over calling someone the R-slur, calling someone a "dipshit" isn't really an improvement over calling someone an "idiot".
Actually put thought into what the ableist language you're using means. A lot of the time the answer isn't to find a "replacement", it's to stop using that language at all and say something else. This is especially true because most ableism isn't actually saying anything substantive, but just expressing a kind of vapid dismissiveness.
Consider: have you ever actually thought about why "stupid" is ableist? It's certainly not from its etymology; the origin of the word "stupid" is just "in a stupor", as in, unresponsive or dazed. It morphed into an ableist term because of an ableist idea that people are unresponsive because they're "unintelligent" or otherwise lesser.
If you replace "stupid" and "idiot" with "foolish" and "dipshit" now, guess what will happen a few decades from now? They'll just take on the exact same meaning, because you're using them exactly the same.
There's some nuance with ableist metaphors (like calling situations "crazy" because they're extreme or out of the ordinary), but even those uses just getting replaced with a different word can easily turn into just yet another euphemism train. Today, referring to someone as "wild" to mean that they're unusual or mentally ill wouldn't register, but that can easily change if people transfer over this replacement "wild" metaphor to people.
Words matter, but you can't solve ableism just by playing whack-a-mole with designated "ableist words", and cutting off what you consider to be ableism at "idiot" and "stupid" is no better than what most people do, which is to cut off what they consider to be ableism at the R-slur. You need to consider your language holistically and actually deconstruct what you're saying. There is no immediate, easy fix to ableism, and until people accept this, it will continue to be ubiquitous.
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