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Yes, it's a common trait. I think once they go down the road of not believing any 'MSM' (hate that phrase), they just cherry-pick what they want to believe. I've had two friends of 30+ years block me digitally and irl for taking them to task on what they believe to be 'real'. Could ruminate for a long time on how we got to this stage, but that's for another thread. My sympathies to you anyway.
Anti-vaxxer, per chance?