Aperson who refuses to recognize an emotion or problem is using the defense mechanism known as projection regression denial rationalization

Denial.

Explanation:

Denial is the defense mechanism that refers to the refusal to accept reality or fact, acting as if a painful event, thought or feeling did not exist. It is considered one of the most primitive defense mechanisms in existence because it is a feature that is part of early childhood development.

Many people use denial in their lives to avoid dealing with painful feelings, weaknesses or frustrations. For example, in the case of someone who has difficulty assuming their mistakes. Afraid of being confronted, this person often denies his faults; He blames it on others because he has no courage to admit his insecurities or flaws.