Arrogance is the hotbed for bad traits
The Prophet (peace be on him) warned us of this disease and Ghazali pointed out that arrogance blocks out good traits while being a hot bed for all bad traits, such as deceit, envy and anger. I pity such people, as they are inflating themselves because they have problem with their confidence. Why do they need to prove to others that they are better than them?
They are probably carrying unresolved emotional baggage from their childhood when they were teased. However the ones who teased were the ones who had bad character, lacked a good upbringing, not their victim. Yet the one who was teased now feels compelled to pretend and portray that they are better than them, and that they know more than them, or that they have more than them, which may not be the case. When this comes to light, it will be even more embarrassing. It does not benefit you to pretend you are someone you are not. It is much better to be a person of dignity and principles.