Why do some smart people get angry when you talk about their intellligence?

I had a friend in high school who always got between 95 - 98% in school and she would get upset and angry if you talked about her grades, like you were insulting her by mentioning it.

And I knew another guy who was also smart and he gave me an angry look when I tried to discuss his credentials with others at our group.

Why do some smart people get angry when you talk about their intellligence?
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