Did someone ever work out the relevant academic theory that describes this linguistic process? A word starts out as neutral, but gradually transitions to becoming a slur (a process that seemingly takes decades), and is replaced by a new politically correct word which is seen as too avant-garde at first, but gets established in part due to a lack of push-back (because any criticism will make the person levelling it se…
John McWhorter refers to it as the Euphemism Treadmill but I can't say if it's a widely accepted term in the field
Also known as "euphemism cycle": https://en.wikipedia.org/wiki/Euphemism#Euphemism_treadmill