You are talking about propaganda, though, at least in part. You keep coming back to pepe the frog. That's a propaganda meme.
And to repeat my prior point: how are memes different than any form of cultural symbolism/allusions?
Cultural symbols often have myriad meanings - and different cultures approach the same set of symbols from extremely different background knowledge bases. I struggle with novels by Japanese writers because I have to learn to key in on a different set of spoken and unspoken ideas. But I also get to. And that's the point. Each new type of symbol broadens, rather than narrows, my horizons.
Ultimately, I think that you are shoehorning something you don't personally enjoy - the meme - as a metaphor for a much larger cultural shift, while also keeping one foot in the literal.
Here's why:
My great fear, like yours, is that younger generations find the long held collection of cultural symbolism and allusions to be foreign to them, and therefore as inaccessible to them as memes are to you. But that's because kids aren't reading anymore and even lack the shared experience of television/movies that we had (due in part to a glut in available stories AND shortened attention spans). We agree on that. And we agree that it will lead to a rise in fascism (as it already has). But I'd argue that you are being too literal in attributing it to the memification of society. As a symbol of larger cultural trends, sure. I get that And I'd have (and did) make the same argument in the mid 2010s. But, IMO, you are late to the game on this one.