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New Literacy Statistics Just Dropped, and it's grim. 50% of Americans read so poorly that they are unable to perform simple tasks such as reading prescription drug labels
(www.thenationalliteracyinstitute.com)
You're talking from a relative position of understanding of these concepts. You're not talking from a blank slate. Even in professional environments that I've been in where everyone went to college and theoretically is fully literate, you would have trouble getting people to retain these concepts even if you used friendlier technical language. You're overestimating the amount of time it takes to actually achieve understanding, there are people on this site that constantly mix up these words and concepts, have a hard time applying them to the real world and misapply them regularly and are self professed Marxists. You're also mistaking cultural policing of agreeing/using these concepts for understanding of them. Just think about how many people in America agree with capitalism but can't adequately explain what capitalism is. They agree with freedom but don't have a working definition or framework of what freedom means. On a societal level this often becomes bromides. My parents and grandparents read Marx in school but couldn't give you an accurate basic run down of Marxist concepts.
Marxism isn't some magical thing. There were plenty of people in the USSR that also didn't understand the system they existed under and it's concepts but reflexively or sheepishly agreed with it.