Why admit you're wrong when you can double down?

The left demands socialism because they hate us and know it will destroy us; we refuse socialism because we know the left hates us.

What a paranoid person would say

And also people who have read 20th century history or even a biography of Karl Marx.

Socialism (in its moderate, sustainable form) has been tested by all the developed countries of Europe to some extent. The results:

https://www.usnews.com/news/best-countries/rankings/quality-of-life

Any American dumb enough to believe in socialism should move to a country practicing it.

Social policies =/= socialism. Socialism according to Karl Marx's own definition is "the abolition of private property". In every country on that list, private property is still a right and so is personal liberty.

Oh, you meant the full theoretical Marxist definition. That's kind of like Plato's Ideal Shapes, innit? Notice that I said "socialism (in its moderate, sustainable form)" -- things like universal healthcare, extended parental leave, publicly funded retirement before 75, ALL of which our demagogues scream are "SOCIALISM!" have been instituted and running in these countries for years, and are the major factor why the quality of life in them is so high.

Well social-policies and social services aren't socialism. They aren't even Marxist. I don't know what to tell you.
But you may notice something about the demographics of these nations: because I find it interesting at how the left will hail these nations as paradises-on-earth when they are also the most ethnically homogeneous, high-trust countries in the West.

I won't argue that the sharing view of government faces less pushback when people imagine that the resources they're putting in are shared with people like them (by whatever categories they imagine that likeness), but all of these countries are growing steadily more ethnically diverse, and still succeeding at what is usually called Democratic Socialism (to distinguish it from the State Socialism of a place like China, where the government exerts a lot more control). But the argument that it isn't socialism because it isn't Platonically ideal socialism doesn't make a lot of sense, unless you don't consider that voting for our leadership makes us a democracy because we don't exactly match Aristotle's definition.

Again, I don't know what it is you want to hear from me: but a government with social services doesn't make it a socialist government. Otherwise, the USA would be considered socialist because we offer social services that serve more people than all of those countries listed do. More than that those countries you've listed have been admired by left for decades as "socialist utopias", yet their governments have made statements asking socialists to "Stop calling us socialist countries, we are market economies" (thinking of Sweden specifically).
So, if these countries don't even identify themselves as socialist and are mostly ethnically homogenous and high-trust societies, that still (mostly) have freedom and liberty, then maybe it's time American socialists regroup and rethink what it is they think they want.
American Socialists have said they don't want to kick out ethnic minorities just to create a high-trust society, they don't want citizens to retain their rights to personal property, freedom of speech, and freedom of self-defense. So, either the American socialists are wrong or the countries that they admire are wrong. Both can't be right.