Think about it in terms of cognitive dissonance. If I have put up with a lot to become a member of a group, if I have voluntarily subjected myself to acute embarrassment, I would have to be pretty stupid if the group turned out to be anything less than wonderful. To protect my self-esteem I will want to convince myself that the group is pretty damn good. Hence the necessity to talk it up, to reframe my perceptions in a positive direction.
