Lake Wobegon effect

A kind of wishful thinking in which actors are willing to believe remarkably flattering things about themselves – a tendency to accept that they are in possession of many socially desirable characteristics, while being relatively free of the socially undesirable. For example, it is not uncommon for people to see themselves as more intelligent, fairer-minded, less prejudiced, as well as more skilled at driving a motor vehicle than most others.

(see also: Self-serving bias, Social Desirability bias)