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How come people are stupid nowadays? Especially on social media
Well if you're mainly on the English speaking web maybe the decline in education since 2013 plays a role.
I'd also imagine tech and specifically internet illiteracy of older generations plays a role.
https://longevity.stanford.edu/older-adults-and-technology-moving-beyond-the-stereotypes/
Not to mention all the bots pretending to be users commenting on things.
The icing on the top is that the algorithms on social media probably know that this kind of wrong will keep you engaged enough to research and make posts about this kind of thing and so it sends it your way to keep your attention.