It is one of my least favourite personality traits; attempting to appear humble to create an image of oneself that others will praise. It is paradoxical, as it is inherently vain, and therefore cannot be humble. It is something that is found often in religion. Priests do it, nuns do it, Muslim niqab wearers are guilty of it. They put up big sign posts, either in the form of their clothing which shows how oh-so modest they are, or by even just outwardly preaching about how wonderfully unselfish and lacking in vanity they pretend to be.
This is one of my main reasons for disliking Corbyn. He has that same dreary, fatuous, and rather puritanical sense of vainly trying to appear as humble as possible. I feel like in another time he would be more suited to being a presbyterian preaching against any kind of fun, but instead here he is preaching against capitalism, which is almost the same thing.
...or just paranoid?