I think you’ll find that the usage has changed on reddit and 4chan from this dated definition. Reeeeeeeeeee is now the voice of triggered liberals. All you have to do is browse the volumes of postings on both to see its current usage.
https://i.redd.it/tdz4wxygg7ry.png
I browse The_Donald every day. You’ve fixated on one usage of the term, but it’s by no means exclusive or even dominant. Are you familiar with autistic screeching?
Know your meme is hardly an outdated source, btw. It’s far superior to the isolated examples you rely on.
