Making mistakes is something they feel needs to happen behind closed doors, something the students shouldn’t see. Flaws of themselves is what they notice, and what they don’t want others to notice. Reflection and emotion happens in secret, not in the classroom.
When students go against the grain, and decide to speak their mind and show who they are, it’s noticed, but not always in the best way. Some may think that’s a factor that went wrong in class that day.