Oh man, this hits me hard.
One day in like 5th grade I was talking in class about evolution, and the class started laughing. I felt like absolute garbage, I was angry, ashamed, embarrassed, and I felt betrayed. It took years for me to realize that what the class was reacting to was that I took charge of the lesson all of a sudden. The people in middle school didn't mean to make her feel ashamed, they thought they were playing along with her. But it scarred her.