Tbh I had totally read the title as "Titled player" at first and needed to read the full post to understand what you were asking.
I think it has a lot to do with the person's ego - with a big one, you won't accept defeat easily thus you'll find excuses for it and react more violently than you should. I have never seen a humble player being tilted (whatever the game for that matter).
Serious answers please - nothing like "by being dyslexic and reaching 2200".