There is nothing inherently wrong with what is described as classical liberalism. For a non-industrialized agrarian economy with a population dispersed over a wide area with no effective communications....the liberalism of our founders was the best available solution
The most liberal of their policies.....All men are created equal
"All men are created equal" is a profoundly Conservative notion.
If rightwinger is claiming that principle as belonging to "liberalism" he must be thinking of what was considered "liberal" back in the days of the American Revolution and the Founding and the Framing. But since modern day conservatism has embraced the principles of the Founders and the Framers, the principle that "all men are created equal" is presently a very conservative notion.
And the principles enunciated by the Founders and the Framers are still the best solution. Today's liberals cannot acknowledge that what was good for a largely agrarian society then is still the best policy today for our more urbanized and industrial society. At least rightwinger comes close to admitting that present day "liberalism" is not on the same page with the "liberalism" of those by-gone days.