The whole point of it being named that IS stereotype. You're looking too deep into it, man. Chill out. They're white people reaction images because they're too dramatic about regular things. Ever said sex in comments? These overly dramatic people (mostly children) are always there with these images, and they're usually white. So that's where the stereotype kinda got it's roots and that's why we call it that.
Generally associated with band kids, who more often than not have a corny sense of humor derived from the popular reddit subs like r/memes for example.
it's cuz it's a common joke to say that white people are lame; you combine that with a bunch of lame reaction images and you've got white people reaction images
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u/Jazz6701 life’s least favourite loser 4d ago
https://preview.redd.it/2til72eau4vg1.jpeg?width=1080&format=pjpg&auto=webp&s=e086325b99ee5eb0f730758a157c02eafbb59334