Yes, it was humorous to see rightwinger pretend that all of the founding fathers' conservative views were merely the result of "an 18th-century mindset," as if modern American liberalism's positions are all of modern origin. What a hoot. This is the kind of silliness that you get from people who've read little or no history.
Heck, a whole bunch of liberal domestic policies were adopted by the Roman Empire over the centuries, and scholars have identified many of them as major causes of Rome's decline and eventual collapse. Some examples include the following: allowing large numbers of immigrants to settle in the country without insisting that they assimilate and respect your culture, debasing the currency, vastly expanding the size of the central government, handing out huge amounts of taxpayer money to curry favor with certain segments of the population, rejecting the importance of the traditional family unit, widespread acceptance of homosexuality and other forms of deviancy, legalized abortion, the policy that the government had the right to regulate any business to any degree the government deemed necessary, a disregard for the right of private property, the policy that the government had the right to control or outlaw religious groups for "offensive" teachings even if the teachings did *not* involve advocating insurrection against the government, allowing increasingly immoral and even pornographic "entertainment," the policy that the government had the right to impose whatever level of taxation it deemed necessary, etc., etc.