Am I being rude to my senior mother she's driving me crazy?

I let my 76 yr old mother live wuth me the past 6 years due to her fixed income.

she's alone all day and is very isolated. She listens to underground politics all.. Day. Long.

I'm working like 8 to 12 hrs a day and when I get home at 8 or 9pm she starts talking about negative shit happening in the world that I know about hearing it from people all day long.

I told her dozens of times I don't want to hear negative politics when I get home. But she persists.

So tonight she starts with a negative story, which her stories are 10 min long, and I say ok I give it 1 min attention then I walk away into my room and close the door. It's her tone also, it's angry and intense.

She gets mad and I hear her say that's it just close the door in my face, then boy oh boy. To herself.

Am I being rude? I'm just saving my sanity. I've said so many times I don't care I don't want to hear it when I get home.

Am I being rude to my senior mother she's driving me crazy?
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