Social liberals should be more appalled by libertarians than social conservatives. Libertarians, on principal, oppose ALL welfare. Libertarians oppose Medicare and Social Security. A true libertarian even opposes zoning laws—want to smelt iron in you backyard? Have at it, but if you burn down my house in the process, you pay. A libertarian is more accurately described as an individualist—they are the polar opposite of not just collectivists but anyone who promotes a social contract.
One of the cultish traits of libertarians, is their disconnect from reality.
Libertarianism of social liberalism and open borders, makes small government and ending welfare and social programs, impossible.
Social liberalism breeds, creates, and even imports, liberal, big government voters and democrats.