Don't let anyone tell you you're a bitch for defending and sticking up for yourself. If people don't want their insecure ass handed back to them then they should probably keep it in their own business & not instigate drama.
Narcissists are afraid of life. They are afraid of being vulnerable therefore they take the most destructive way to gain control and power. They hurt people to make themselves feel better, strong and superior. They try to control and dominate others because its distracts them from dealing with their own issues.
An insecure woman seeks constant reassurance that she is beautiful, valued and loved. This is why you find insecure people to be such attention seekers. They are looking for validation that they are acceptable as they are.