First, I appreciate your calm response in the context of my sarcasm. It's not what I'm used to on the Internet, and it's refreshing.
My simplest answer is that I don't know. Neuroscience has made a lot of progress in the last several decades, but I'm unaware of any credible researchers claiming to have a unified theory of consciousness yet. We probably still have a long way to go, assuming it's even possible to know.
That sounds like a swell, materialist solution, but it just kicks the can down the metaphysical road and creates more questions than it answers. What parts of the brain interact to create it? What is the subjective experience "made" of? Some kind of energy? How much complexity is required for it to emerge? Are there levels of consciousness? Are babies born with a consciousness that grows more robust over time, or does it pop in at some discrete level? Does the galaxy have an emergent consciousness, it's certainly more complex than the human brain. What about the universe?
Even if "it's an emergent property" is true, it's not a very useful answer. It's like saying babies come from the hospital, it skips over the part we're asking the question about.
Panpsychism is probably the most scientifically conservative explanation of consciousness. "Energy fields permeating the universe and interacting with each other" is the model scientists use to explain many, many phenomena, from electromagnetism to mass.
The default response I get most of the time I comment on things is along the lines of "You shouldn't have thoughts or opinions and because you shared them I'm going to get as many other users to attack you as possible."
Thought this might be different considering the context of this post, but here we are. You're getting downvoted as much as you are upvoted for pointing out that someone is trying to manipulate the context to attack me. No responses either because if they aren't actually bots they seem to have trouble coming up with any kind of understandable explanation for their behavior.
It's like being in traffic and getting flicked off by the person that cut you off... when there was no one behind you...