On the other hand, most masters will not call themselves that, and will resist being labeled as such. Because ironically, true mastery can only be achieved through humility.
No, I don't think so. There are many masters in music who can be quite arrogant, don't see why it can't be applied to programming.
Also, those people who don't call themselves 'masters' may not do so for the sake of their public image. Once you start working with them you'll know what they really think.