One of the trendiest fads today is called constructivist education. If knowledge is a social construction, as Dewey said, then the goal of education should be to teach students how to construct their own knowledge. Read this description by a proponent of the method: Constructivism does not assume the presence of an outside objective reality that is revealed to the learner, but rather that learners actively construct their own reality.
That’s a pretty tall order: Before kids are big enough to cross the street, they’re supposed to learn how to “construct their own reality.” Teachers are not to tell students that their ideas are right or wrong, either, but merely to encourage them “to clarify and articulate their own understandings.” After all, there are many different possible ways to construct the world, and constructivism cannot rule out any viable theory that encapsulates personal experience.
As one prominent constructivist writes, “To the biologist, a living organism is viable as long as it manages to survive in its environment. To the constructivist, concepts, models, theories, and so on are viable if they prove adequate in the contexts in which they were created.” Notice that the passage speaks of ideas being viable, not true. Constructivism is based on the assumption that we are merely organisms adapting to the environment, so that the only test of an idea is whether it works.