A person who believes they are doing something right or good while being oblivious to the flaws in their thinking, belief, or execution is often described as having a "blind spot" or exhibiting
"
confirmation bias" in their thinking, where they selectively focus on information that confirms their existing beliefs and disregard
contradictory evidence.
Other relevant terms depending on the context could include:
"Self-deceived":
When someone is actively misleading themselves about their actions or motivations.
"Dunning-Kruger effect":
A cognitive bias where people with low ability overestimate their own competence, often leading to a lack of self-awareness about their mistakes.
"Illusion of superiority":
A related concept to the Dunning-Kruger effect, where someone believes they are better than others, even when evidence suggests otherwise.
"
Cognitive dissonance":
When someone holds conflicting beliefs or behaviors, which can lead to them rationalizing their actions to maintain consistency.