Goffman calls this process as Impression management
Impression management is a conscious or unconscious process in which people seek to influence other people's perceptions of people, objects, or events by regulating and controlling information about social interactions.
It was first conceived by Erving Goffman in 1959 in "Presentation of Self in Everyday Life" and in 1967 "Responsibility for Negative Results") and Consistency ("Speaking in a way that is consistent with the goal" or Extend to include "act"). With many others. These behaviors allow those who participate in impression management to control others' perceptions of events that affect them.
Libertarians have a proper understanding of liberty and dignity. It wasn't until the 1850s that the GREAT EVILS of the philosophy of liberalism started to take root in the feeble minded.
Some labor unions opposed immigration because their members believed immigrants would take jobs away from native-born americans. So this was a way to protect the native-born americans in their way.
Explanation: he is probably feeling inferior himself or he feels less qualified in the subjects or he just fail at teaching them hence in order to feel better he has to think that it's because they are intellectual inferior or make it feel like they are not intellectual so that he may feel better about his probably failing teaching methods.