I actually noticed back in my days at university that the academics who used "I" in their talks instead of "we" or "one" tended to be a complete waste of attention (with very few exceptions). May or may not be related.
Completely related.
Blowhards that are haughty and full of themselves. They overestimate their own intellect, skills, and importance in the world.
Deep down inside they are completely insecure and miserable.