IMHO, we are arrogant about our humility. We do humble better than other arts for various reasons such as we don't compete and we have a spiritual/philosophical base.
Humility is being able to admit we do something well but not making a big deal out of it because if others train like we do they would be better at it and more humble than we are. If you really don't do it well then you have nothing to be humble about.
Other arts take pride/arrogance in their competitiveness and victories. We take pride/arrogance in our cooperation/harmony and lack of winning over others. Same process just different content.
Humility is not in the art, its in the person.