I'm so very sorry you are going through this. I have a feeling that around this time next year, estrangement will become a "normal thing" in the US. As someone who had to estrange from her own parents for completely different reasons (we are all liberals—believe it or not), I think that is a horrible thing...but sadly a necessary step—especially for those of us in white families (not sure of your race, but seen in in my ILs and I noticed a lot of white friends' who are Millenials/Gen Xers seem to be going through it with their families). .
We have been taught to enable racists and sexists for far too long under the guise they are "traditionally-minded" or older. It's clear this does not work, and it's time for that to stop. These people don't want political discussions. They want someone to bully and scream at—even their own kids. It's a shame, because if people could talk politics while being respectful of one another, everyone would be better off. Likewise, these people have really selfish views across the board (on social and environmental issues). They are going to leave nothing left for us and our children.
> I want my Damn mom back! I want the kind caring woman who raised me. Who always told me she loved me more than anything.
Okay, you need to know, it's probably not propaganda and politics right now that's doing this to her. She was either always like this mentally, and it became more apparent when you were an adult—or she is possibly ill and has a physical brain condition. Dementia really can wreck a person's perception and many of Boomers (I apologize if I have her generation wrong, but she's a grandma so she's older) are starting to grapple with it.
There's just something about propaganda that really hooks onto people who are mentally ill or have dementia. Fear is a big symptom of many of these, and that is exactly what propaganda seeks out. Nostalgia is another thing the prey on—and that can lure in anyone who is older and depressed.
You had a human moment. You say you don't regret it, but that may change as it sounds like you took the nuclear option. Please understand there is nothing wrong with it as what your mother said was shocking, disgusting and the world (especially the US) is going through a lot. If you ever feel bad about it, please remember this and forgive yourself. I say this from my own experience as someone who is estranged. Even when a reaction is completely understandable and justified, if it's extreme, we can feel bad or sad about the way we behaved. Also, it is very normal to go into grieving—as you would with someone who passed away. If it interferes with your life or feels unbearable, please do not be afraid to seek outside help.
So sorry you went through this. Many of us (especially in the US right now) can relate.