Dennett's center of narrative gravity essay rests on one very questionable assumption. He posits a robot equipped with sensors and actuators that allow it to interact with the world and other beings (e.g. asking for help if trapped), and he also posits it possessing the computational capability to create narrative, including autobiographical narrative, from that interaction. But he also declares it non-conscious, using phrases like "clanking machinery" to make the idea that the robot could possibly be conscious sound absurd.
He has, most likely, thereby entangled himself in a contradiction. He has essentially re-invented the p-zombie in mechanical form. That is not a coherent concept, if the computational process of creating narrative (including autobiographical narrative) from interaction with the world is what consciousness actually is. Or if consciousness is a necessary component of that processing ability.
Ultimately, the idea of a self comes not from some memetic illusion, but from the evolutionary process from which the cognitive processes in question arose. Evolution requires competitive interactions between replicating organisms. If there are no competing replicating organisms with varying traits, then there can be no evolution. Since evolution is a historical fact, organisms must exist.
We instinctively associate the self with an organism. ("He hit me" generally meaning that someone struck my material body, not that he struck the ongoing computations in my neurons.) The self is not necessarily the organism, but it refers to the organism, and it originated and derives its function from the organism's participation in evolution. The computation that writes this post receives direct sensory input from only one set of sensory organs, actuates only one set of muscles, and has memories of interaction with the world only by those means. There is nothing misleading or inaccurate about calling any or all those things "my self."
That's why I asked, in all seriousness, where the illusory-self-causing "memeplex" that you claimed "crawled into [someone's] head" crawled there from. Of course you couldn't answer, because it the memeplex you describe couldn't and didn't come from anywhere else. It was there first. In biological history, it was there before the first nerve cell evolved.