This is that believing in yourself. That you are good looking, sexy, smart, successful, capable, ect are all beliefs of arrogant egotism! Basically every belief that one could have which results in overall fulfillment and success for themself is condemned and "outlawed" by all the above mentioned groups. Talk about one of the major reasons for problems in society.
Especially big business, the self help industry use this fictionalized idea of "arrogance" to sell their progress. Basically by saying, "who are you to think that you know better than us? That you would know what's best for you own good, and that you can make the decision whether or not to buy our product? The biggest mistake you could make is to be so arrogant as to not give us your money, because WE KNOW BETTER.
Well, I'm here to tell you they don't know better. In fact most of them are idiots who have flushed their whole lives down the toilet with nothing to show for it, and even if that describes you as well, it only puts you on an even footing with THEM.
Bonus:
The only difference between this arrogance/egotism and true self confidence healthy mindset, is power of belief. This is a matter of extremes. The least you must settle for is ultimate, absolute belief, affected by nothing even up to the day you day. The same level of belief as the samurai who would die for their honor, or for their belief in fighting. OR of the Zen Master who was resolve to talk to the stones for the rest of his life.