de Tocqueville noted the individualism inherent in American culture almost two centuries ago. He also saw the potential for this to lead to social fragmentation and the isolation that you mention. Of course, he never foresaw the accelerative effects of electronic media on this fragmentation.

Distrust based on political ideology and media indoctrination is real, and I feel it in my own neighborhood. Sadly, I find myself thinking about someone after a pleasant interchange, “Is he one of them (MAGA)?” The answer is often yes, but we can still get along.