Very few elite level athletes get there by believing they're only pretty good.
Don't get me wrong. I think humility is a laudable trait, but arrogant people learn new things all the time. In fact, I could be argued that at some point, too much humility can be as limiting to development as too little humility.
Yeah for sure, I think it may come down to what we define humility as, or what context it's applied. I don't mean humility as in self-deprecating beliefs, but as a realization that I of myself don't know everything, and I am willing and open to learn.
Definitely excessive humility is quite stifling ("ohh I don't know aaaaanythiiiing.."). And of course arrogant folk can learn. BUT there has to be a degree of humility for you to be willing to learn I'd say. To be willing to learn is to admit that I haven't perfected something, I haven't learned everything. To me, humility is not a belief that "I'm horrible at life, I'm incapable" etc etc, but an attitude of stepping back, lowering any self-inflation to put you in a better position to be receptive to life and learning.
I think it depends on if a person's errr.. persona as a GENERALITY is arrogant, but can display humility within the context of learning something they want to pursue is maybe the point of distinction here. I certainly am not decreeing the meaning of any of these, just trying to flesh it out a bit maybe; it seems as though it (arrogance/humility) could be an "overall personality trait", or a trait to employ through the use of learning, or to aid/hinder certain specific situations....
As for believing it's a trait that can't be learned that's fair enough, I do get what you mean. We'll have to agree to disagree there, I feel it may get into the nature vs nurture debate which I will step aside there XD.
Things like respect, humility etc are only available to those willing to drop any obstacles to that. Sometimes it certainly does take really life altering events for sure!