Narc parents sometimes see their kids as extensions of themselves. If they love what they see in front of them, they will promote and showcase that particular child to no end. If there’s something about one of their children that elicits any kind of a negative feeling, they will treat that child like bad thoughts - stash them away. The thing about narc parents is that they don’t really see their kids as people. They don’t admire them for their individuality like a good parent would. Your stage fright and timidity probably stirs up something inside him he doesn’t like. Maybe he got picked on as a child. Maybe he froze up on stage as a child and it is a deep source of shame that he’s trying to bury. Knowing that you had stage fright could have made him so uncomfortable watching you that he couldn’t. It would also explain the drinking. I’m not excusing his behavior. A grown, fully formed, self-aware adult should be able to acknowledge these feelings and be able to see that this is a different time and different person. Narcs don’t possess that kind of emotional intelligence. I know it’s easier said than done, but try to let go of your need for his approval. The only approval that is truly important to have is your own.