It's only subtle because it is presumed to be eternal and by default. It is only subtle because it is everywhere and has been everywhere for the lifetime of everyone currently in existence. I'm sure liberals thought differently at the dawn of liberalism, had different opinions based on their lived experiences with previous systems. But capitalism has been around so long and so strongly sewn its own narrative and the narrative for its enemies like socialism that even old people telling stories are just telling stories about slight differences in the same system.

By contrast communist, anti-imperialist, anti-nationalist, anti-American propaganda would be INCREDIBLY jarring to people who have spent lifetimes not noticing or assuming as normal the things you're railing against.

So quite frankly you don't understand. For younger people growing up after the revolution it would be easier but they'd still have older people selling tales and lies about how things were different or better under capitalism. To get to the point we are now with capitalist propaganda not even being noticeable would require the first generation who grows up under socialism to have kids and die themselves and possible for those kids to also grow up and die to sever the memories and propaganda of the old.