Someone who never thinks they are wrong could be called a "know-it-all," "incorrigible," "arrogant," "self-righteous," or "narcissist." These terms describe people who exhibit an inflated sense of self-importance and a lack of empathy for others, often leading them to believe they are always right and everyone else is wrong.
While these terms can be used interchangeably, they can also have slightly different connotations. For instance, a "know-it-all" might be more annoying than malicious, while an "arrogant" person is likely to be more aggressive and dismissive of others. Ultimately, the specific term you choose will depend on the individual's specific behavior and the context of the situation.
