>>124569this isn't quite true
if you check desu you can see the term in relatively common use across various boards back in 2010, even before /r9k/ became an r/4chan screencap factory
it simply originates as one of those extremely common shortenings of commonplace vocabulary, BUT was more strongly selected in normdom after the fact because it doesn't have any slurs in it, however those are two different developments
the frogposters
>>124687 mentions were using normie alongside their hideous pee pee poo poo pics where pepe shat down wojak's throat and such, and that wasn't picked up by the masses either, they weren't into it, but normie was acceptable enough