I spent most of 40 years in the SF Bay Area, surrounded by that lot.
It wouldn't get through to them. Even if you document everything you say with verifiable sourcing from outlets that they trust, they have an armor of facile rationalization that allows then to dismiss anything short of getting a shot to the chops of hard, cold reality.
I had an outright commie friend there for many years- Soviet propaganda posters up in the wall of his bedroom- who insisted that there was no such thing as objective reality. There's 'your reality' and 'my reality' and they are equally illusory. People like that need to live it before it gets through to them. They believe what they want to believe. As long as the wheels keep turning, they can get away with that.
Yeah, he's still a friend. He doesn't proselytize. He's a great cook, an ancient history nut, and gets back up after I knock his bullcrap down, no hard feelings. Oddly enough- he's pro-2A, and for the right reasons.Yeah, I have weird friends- he's not the weirdest.
Bottom line- it's like teaching pigs to whistle. It wastes your time and annoys the pig.
I just think it would be worthwhile to get their reactions in order to instigate discussion that might reach some of the reachable in the middle. There is no curing old commies like your friend. In the USSR, some went to the firing squad shouting “Long Live Communism!” etc.