Comment: This is a secondary phenomenon in our schools, today. The primary problem was created by the reforms of the education system that started in 1980s (US) and 1990s (Canada). This teacher, most likely a victim of the reforms herself, is just hiding her incompetence in academic subjects. She does what many incompetent people do: she finds a trendy substitute topic to “kill the time” between the bells. She should be fired but the topic is “politically correct”, so she feels safe and “justified”.