This was the top post when I checked Lemmy this morning.. Mod commented to mark the post NSFW, even though it wasn't NSFW as far as I could tell. Post was locked and had a ton of deleted comments.
Oh boy, have I got news for you, 'jerk' is an ableist slur akin to 'spaz'.
jerk(n.1)
1550s, "stroke of a whip," from jerk (v.1). Sense of "sudden sharp pull or twist" is by 1570s. Meaning "involuntary spasmodic movement of limbs or features" recorded from 1805.