People like to throw out that one line from the blog comment because it is a wonderful partisan critique of the modern Republican party. But I think it is more interesting with the first part of the comment [0]:

"There is no such thing as liberalism — or progressivism, etc.

There is only conservatism. No other political philosophy actually exists; by the political analogue of Gresham’s Law, conservatism has driven every other idea out of circulation.

There might be, and should be, anti-conservatism; but it does not yet exist. What would it be? In order to answer that question, it is necessary and sufficient to characterize conservatism. Fortunately, this can be done very concisely."

[0] https://crookedtimber.org/2018/03/21/liberals-against-progre...