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the euphemism treadmill is a description of linguistic patterns, not a get out of rule free card
(files.catbox.moe)
Using ableist language as insults is always bad, even if the words seem innocuous. Some may reference the "euphemism treadmill" to try to justify their behavior, but it's crucial to understand that the treadmill is merely a linguistic observation. It does not exist to normalize ableist behavior.
what is the euphemism treadmill for those who dont want to google
Anything is ableist if that's the intention is to be ableist. "Cognitive impairment" or "Brain damage" are clinical terms, but if one decides they can also be ableist insults.