DogWhisperer
I think that both of you are looking at the Trump / estrangement issue in terms which are far too black-and-white. Politics in Western democracies is a complicated issue (unlike in dictatorships, where it's very simple; you either agree with the dictator or you disappear). I'm not in the USA, I didn't vote for anyone, so I'm watching this from the sidelines, but I can see that it's possible for a reasonable person (or parent) to vote for Trump in good faith.
For example, you might disagree with his policy on abortion but agree with his policy on gender because you think that men can never be women and vice versa. Or you might disagree with his policy on Ukraine but agree in principle with his policy of making Europeans pay more for their own defence. Or you might agree with his policy on enforcing immigration rules in principle but feel unhappy about the way he is doing it in practice. Or you might live in the Rust Belt and be so desperate for him to bring jobs back to your area that this may be the single most important issue for you that overrides everything else. The point is, it's possible to vote for Trump without being a monster, and I think it's completely wrong for children to estrange their parents on this basis.
These trumper parents aren't being estranged for simply voting for trump, they're being estranged because they're part of a cult, blindly following and excusing everything and anything trump does. For people with empathy and reasoning skills, it becomes incredibly frustrating to have any sort of rational conversation with these cultists, especially as trump continues to stupidly and maliciously ravage America (and even other parts of the world). A lot of these trumper parents are simply choosing trump over their own children, who may sometimes even be directly affected by his policies (or have dear loved ones who are affected).
They aren't just poorly educated, but permanently willfully ignorant. Ignoring anything said by their children by calling it "fake news", or outright dismissing it as "trump derangement syndrome".