Answer: Delusion of grandeur which may be accompanied by Narcissist personality disorder
Explanation:
A delusion of grandeur is the false belief in one's own superiority (in this case think he is better than anyone around him and he is such a Narcissist that he doesn't even care about hurting others in the process) , greatness, or intelligence. People experiencing delusions of grandeur do not just have high self-esteem; instead, they believe in their own greatness and importance even in the face of overwhelming evidence to the contrary.