Apparently, "anarchnocaptialists" are the libertarians who dare talk about returning government to the limited role it had prior to the 1910's. The insult is usually followed by a statement along the lines of "Why don't you go to Somolia and see what a libertarian paradise is really like!"
So here's a reasoned and relatively mild take-down of these idiots:
Very few libertarians want a divorce from society in which
government exists. We instead point out the destructive consequences of
the policies statists promote, and indicate that further eroding of
power of the individual will have no benefit to society. The
authoritarian underpinnings of the modern leftist are easy enough to see
for those who but try to see them ("You must buy health insurance."
"You must send your children to public schools." "You must not have too
many firearms."). It is why I don't refer to leftists as "liberals."
There is nothing liberal about them.
But to a good leftist, any dissent from their political point of view must be retaliated against. How
could someone in favor of universal health insurance possibly be
authoritarian? Obviously this person is an "arachnocapitalist" who only
wants to see poor people dying in the street. And if you don't think
we should subsidize "green" energy then you're obviously a shill for the
oil corporations. How dare you advocate for school choice! Why do you
hate teachers? How is it these people don't embrace our utopian
society! What rubes! They're obviously not sophisticated enough to
understand our nuanced approach to freedom.
Poking holes in their belief system that shows the Leftist Emperor
indeed has no clothes is fraught with personal attacks, because it not
only shows the skeleton upon which progressivism is built, but because
it exposes their sense of moral superiority as a sham.