keep negative people out of my life

I’ve faced a difficult trial these past few weeks and those people in my life who one would think could be counted on in a crisis to help have been more trouble.
One, unfortunately is my mother. I’m now thinking about my older brother’s example of distancing himself from her for his own sanity. I’ve always been too close, too involved in all her troubles. And too willing to step out and help her in her needs. And when I have a real crisis and need her help, she’s too self absorbed to become willing to even help a bit. Even to the extent of calling me up and telling me all about her “troubles” instead of asking how to help me with mine.
The other person that I’m eliminating from my life is this chick who has said that she considers me her “very best friend in the whole wide world”. So, last week, instead of coming over and maybe saying, “I see you’re under a lot of stress right now. How can I help?” She comes over and is all like “What’s wrong with you?”
Too negative, too argumentative, not open to listening or if she is shutting her trap for even one minute to listen to you, she’s not HEARING what you’re saying because she’s too busy forming her next comment or verbal rampage. What is truly sad about her is that she’s so religious. She’s always spouting scripture and is all preachy to everyone, even her “best friend”.
Sometimes, we want a good friend to just hear us, or listen with some understanding. Not try to fix us or place additional weight on our shoulders with scripture or her own selfish agenda.
So, I’m eliminating this toxic person from my life.
And I want help to discern those people who I entertain, or enable, to continue their toxic ways in our relationship. I won’t tolerate that anymore. I deserve better!