pratfall effect

is the tendency for a mistake to make a highly-competent individual more attractive and an average person less attractive.

In social psychology, the pratfall effect is the tendency for attractiveness to increase or decrease after an individual makes a mistake, depending on the individual's perceived ability to perform well in a general sense. A perceived highly-competent individual would be, on average, more likable after committing a blunder, while the opposite would occur if a perceived average person makes a mistake. (wikipedia)

pratfall effect, n.Definitions

pratfall effect