The goal of a narcissist is to make others miserable, especially those who find it easy to love, because they do not have that capacity.
The best way to handle this is to be happy and love anyway. If you fight back you become miserable, just like they are and they have achieved their goal.
If you have a cpanel you can block the IP address. I have only done that with a few addresses, one in particular which had posted lies and slanderous comments about my personal life. Usually if I mark the comments as spam via my tabs underneath the comments they are blocked for good. I am sorry you have to deal with this, it is an annoyance but it is also the price of being successful. 🙂