There are many that say the most humble people are the highly trained individuals and the martial artists. These are individuals that have attained the training mindset and have reached a level where they do not need to prove anything. It is usually the untrained that are often the most cocky, as they often overestimate their abilities.
However, the worst individuals seem to be the beginners who have trained for a short period of time. These are the individuals that have not learned the humility and are out to prove their newly attained skills. They perhaps have the biggest ego between the 3 groups.