An interesting article and so relevant.
Do you know what narcissistic personality disorder is? Would you be able to spot it if you had to? For most people, their belief is that narcissism is “easy” to spot because laymen and pop psychology characterize narcissism as: selfish ambition, arrogance, cockiness, inconsideration for others, and a strong desire to be at the top of the game. But narcissism is truly difficult to spot in everyday life because some of the kindest and nicest people could be a narcissist. Narcissism doesn’t always shine through the moment you meet someone. In fact, narcissism may not fully bloom until you’ve married the person, accepted a job from a company led by a narcissist, or after many years of knowing the person. In reality, narcissistic personality traits are often hidden by the person’s ability to “act” ways they know other people like.
Read more here
Cassandra’s post also explains this in more detail.