I stopped being so open about the fact that I disowned my narcissistic mother, at least among strangers. I got sick of all the arguments from people who would also want nothing to do with her, if they ever had to misfortune to meet her.
She is a nasty, vindictive, obsessive person who goes out of her way to hurt people. She sees people as tools to manipulate, not as human beings. The only relationships she has ever been able to maintain are with people too afraid of her to leave.
But sure, tell me again how blood is thicker than water.