I don't have NPD but I am aware that you live by different emotional rules. I don't like to be made to feel stupid or beneath people though and it can make me angry too. For me it's because it hurts to always feel that though and I don't need reminding, which I am guessing is different for you?

I would say from an NPD point of view, that perhaps remembering that allowing yourself to react to that in an angry way puts you beneath that person and naturally makes you less of a person?

I am sorry I can't help more x