I have written about the conflict as an undergraduate with a professor of philosophy over the definition of philosophy. The professor who were unaware of the definition of philosophy and was teaching philosophy. The reality is that this is not only applied to the professor but to almost all the people in the world.
People can protest, 'How on earth can people know everything?' However, if they know the fact that their words and behavior can change their present and future, they will not be able to say so. Furthermore, if people, who teach others or have effects on others socially, politically, economically, etc., are unaware of the definition of what they are doing, this is a serious problem.
Long ago, Socrates in Athens of Greece is recognized as one of the four greatest teachers of the human races, only by the fact that he could realized that he knew nothing.