Now, I want to ask you something. Exactly what are you disputing with him now?
Legal positivism (the notion that "law = whatever the people in power say") is a description of how law works when it's being monopolized by the state. I have pointed out many problems with this notion of law, such as the fact that it's whim-based, chaotic, disorderly, and unpredictable. Some interlocutors still cling to the notion that legal positivism is the only valid notion of "law" and every non-state or non-top-down approach to "law" is not actually "law" but something else, be it "justice" or "morals" or whatever.
I am sticking to my principled and substantiated stance that law as a philosophical discipline is a subset of ethics, and that objective ethics grounded in metaphysics exist and can be identified through philosophy. And that the real consequence of legal positivism is to just light all of legal philosophy on fire and replace it with the word "might". Cf. my assertion that the statement "might makes right" boils down to "might makes might", aka 1=1, a completely meaningless tautology. The "law" under the state is pure whim, and it is a complete and utter delusional utopia to think that a peaceful, orderly, and prosperous society can exist under a government as such.
Like, even if you go ahead and declare that everything they say is 1000% true, that power is whim and might decides everything, then the obvious conclusion is that no monopoly of might should ever, for even a second, be canonized as "the law".
My question then becomes "why tolerate this absolutely miserable state of affairs? Why not do something about it? Why submit to a system you already admit is chaos?"
I mean, what answer can people even give for why they're not anarchists?
"But anarchy would just mean fights between gangs"? But the state already is the biggest gang, and gang warfare is the current state of affairs under the beloved state. And under the monopolistic state, you have no exit, no competition, and no recourse.
"But people need a ruler"? Then explain how every resistance, revolt, or secession in history happened. If "obedience to power" really were human nature, then disobedience wouldn't exist. So either I'm not a human or your take on human nature is wrong.
"But at least state law gives stability"? Nonsense, even the legal positivists in this discussion have conceded it's probabilistic at best, and I didn't even need to go in-depth on universal things like corruption, discretion, and selective enforcement. If you want actual stability, you need universalizable and non-contradictory rules, such as those I advocate for.
"But anarchism isn't realistic"? Neither was the Earth orbiting the sun, or germ theory, or the abolition of slavery and feudalistic serfdom, until people stopped. "Realistic" just means "what people tolerate", so stop tolerating state coercion.
"But people are selfish/violent/animalistic/black/____"? Exactly. And that is why people should not be trusted with monopoly power. If people are bad, then why tolerate being ruled by people?
Like, what's the statist excuse?