It's this. Most undergraduate students do not go to office hours, try to get to know their instructors, ask follow-up questions, pursue independent research, or do anything approaching "apprenticeship". Most American students matriculate into college/uni not even having ingrained behaviors that make any of these things obvious or approachable, so yes, it's understandable why many would consider higher ed the same as secondary ed: rote memorization and "bad" classes.