Confidence is being sure of your abilities, with the situation taken into consideration. Arrogance is being sure of your abilities, regardless of the situation. You think that you superior because you are you, and they are not. Nothing can trump you, and unless you're perfect you won't be content.
A person that brags about their victory and who, before the competition, cares more about how the fans are gonna love what they're seeing is arrogant.
A person that thanks people who are responsible for supporting them, and before the competition, cares more about the actual competition and what it's about is confident.
In my previous thread that compared hate to apathy I chose the emotional feeling as the better one, but in this case I will not. I think that arrogance is worse than confidence in every way because not only does it leave you feeling more empty, but you're focusing on the wrong stuff.
I've made this thread because I recognize that my bravado that I put on when I'm exaggerating sometimes crosses into arrogance. Forget that others don't like arrogant people, in the long run it's a detriment to myself. Often times when putting on personas, be it online or offline, we border into arrogant behaviour, and end up being arrogant.