Arrogance has never been an attractive personality trait. It is even less attractive when it is unwarranted. When I meet a person that is not particularly good looking, not particularly talented or not particularly intelligent that walks around with a swagger as though they are “king shit”, I automatically assume that they are either a gang member, a member of a weird religious cult or a government employee. Who else, besides an individual with the power of a group behind them, would engage in such behavior? This is, of course, assuming that they are not delusional.
It has been my experience that people with genuine abilities will have the tendency to downplay them. The reason should be obvious. They do not feel the need to prove themselves.