I have been dealing with arrogance in my students.

Arrogance is unearned boastful superiority.
Most people don’t know, don’t care because they themselves are not achievers… but you can have confidence that is justified by your accomplishments, your superior knowledge.

To the uninitiated, they look and sound the same. But they aren’t. You only need to scratch the surface.

I have detected a certain ancestral commonality in that behavior.

And have been pondering why and how and for what purpose are certain nationalities arrogant.