Sounds like classic Narcissistic Personality Disorder (NPD). I loathe saying that because people throw the word around for any rude behavior. Don’t listen to me, here’s the Diagnostic and Statistical Manual 5 (DSMV) official description:

as signified by the existence of any 5 of the next 9 standards (American Psychiatric Association, 2013):

• A grandiose logic of self-importance
• A fixation with fantasies of infinite success, control, brilliance, beauty, or idyllic love
• A credence that he or she is extraordinary and exceptional and can only be understood by, or should connect with, other extraordinary or important people or institutions
• A desire for unwarranted admiration
• A sense of entitlement
• Interpersonally oppressive behavior
• No form of empathy
• Resentment of others or a conviction that others are resentful of him or her
• A display of egotistical and conceited behaviors or attitudes

I would add:

• An inability to admit they are wrong under any circumstance.

Perhaps the other line items cover that?

My mother hit hard on 4-6 of those items, so I do have some experience with the type. Sometime in my early 40s I realized I had never heard the woman admit to being wrong, or state an apology, ever, not once. Kinda freaked me out to muse on that.

I have no idea how to help such a person. How do you help someone whose very personality hinges on the idea that they’re already perfect? It would be telling to have them read the above and see if they find any of that in themselves. No? LOL, that’s a clue.