Illusion of asymmetric insight
Encyclopedia
The illusion of asymmetric insight is a cognitive bias
that involves the fact that people perceive their knowledge of others to surpass other people's knowledge of themselves. The source for this bias seems to stem from the fact that observed behaviors of others are more revealing than one's own similar behaviors.
Relatedly, people seem to believe that they know themselves better than their peers know themselves and that their social group knows and understands other social groups better than other social groups know them.
Cognitive bias
A cognitive bias is a pattern of deviation in judgment that occurs in particular situations. Implicit in the concept of a "pattern of deviation" is a standard of comparison; this may be the judgment of people outside those particular situations, or may be a set of independently verifiable...
that involves the fact that people perceive their knowledge of others to surpass other people's knowledge of themselves. The source for this bias seems to stem from the fact that observed behaviors of others are more revealing than one's own similar behaviors.
Relatedly, people seem to believe that they know themselves better than their peers know themselves and that their social group knows and understands other social groups better than other social groups know them.