Everyone is wired to feel shame; our heads drop, our faces flush, we feel poorly about something we have said or done. Everyone is also wired to respond to shame but cultures develop different styles of response and our culture has developed a style of masking shame.
Narcissists in the Bible are often referred to as stiff-necked people who refuse to feel shame. These people will not hang their head regardless of what God says about their behavior.
The enemy wants us to be ashamed of the things God is proud of and proud of the things God says we should be ashamed of. Grace is the remedy and narcissism is its arch-enemy.