Red Flag #17. You find yourself explaining the basic elements of human respect to a full-grown man/woman. Normal people understand the fundamental concepts of honesty and kindness. No adult should need to be told how they are making other people feel.
It's disgusting when someone calls you insecure when they don't know the reasoning behind it. 90 % of the time there are valid reasons! There are things going on in the relationship the others have no clue about.
Narcissistic family members will deny and lie to protect each other and the family dysfunction. They want to keep pretending that nothing is wrong. If you speak up and acknowledge the family abuse and manipulation, they will unite and turn on you, then convince themselves that they are a strong united family.