Why are some academically smart people so dumb and superficial in their spare time?

Anonymous

I've noticed that many smart undergraduate students with great marks are full of clichés in their conversations in spare time, or they shout and behave like idiots when they go out. They get good marks, but when you want to talk about the degree outside the class, they don't want to talk about it and seem so bored of it.

Why are some academically smart people so dumb and superficial in their spare time?
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