Left can't meme because it hates sex.
I don't mean fornication, I'm talking about sexuality itself. It's a seedy, violating, fundamentally unequalizing thing that requires lots of work to not be grotesque. Their superficial taste for the ugly and depraved is more of a hyperreal fetish than a natural territory thing.
Why Deleuze cautions against absolute deterritorialization leading into fascism (or really how everything leads to fascism with them), or how the likes of Bataille go all edgy and whoremongering but he never spilled any blood despite the silly cultist shit.
Memes are at the animal level where cruelty, comedy and corruption mingle. If you can't tolerate that space you can't really converse in them. As a counterexample nazbol or tankies seem IME to have more ability to meme than woke types. They're closer to violence, work, etc.
(btw this is a parodical thread of my perception of philosophical modes of "explanation", I like to indulge in it every now and then as a joke and exercise)