What does only a masochist could ever love a narcissist means?
A Masochist is someone that loves pain, in short, and very
generalized. Loving a narcissist is about pain, therefore only a
masochist could love a narcissist.
Having said that, I think someone was being very sarcastic when
writing it as anyone can fall in love with a narcissist, they are
very charming and morph themselves to you, for awhile. I think they
were trying to make the point that only a masochist could enjoying
loving a narcissist, due to the pain part. On that I concur.