the euphemism treadmill is a description of linguistic patterns, not a get out of rule free card
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.
Interesting. Feels like there's a bit of a paradox, where we need a term to address a group of people who are being "othered," but while that's the case, there will be people who use that term as an insult.