I remember while growing up, my parents would talk politics over the fence with neighbors as easily as they’d talk tomatoes. It was polite, civil and people’s opinions were all over the place.

I’d get into heavy discussions about religion with one of my best friends. We sincerely wanted each other’s opinions.

Those days are over.

In fact, in a Cato Institute survey self-censorship is the norm:

A new Cato national survey finds that self‐​censorship is on the rise in the United States. Nearly two-thirds—62%—of Americans say the political climate these days prevents them from saying things they believe because others might find them offensive. The share of Americans who self‐​censor has risen several points since 2017 when 58% of Americans agreed with this statement.

These fears cross partisan lines. Majorities of Democrats (52%), independents (59%) and Republicans (77%) all agree they have political opinions they are afraid to selfshare.

https://www.cato.org/survey-reports/poll-62-americans-say-they-have-political-views-theyre-afraid-share#liberals-are-divided-political-expression

The survey found that only very liberal democrats feel free to express their opinions.
Middle-of-the-road Democrats self-censor as do Independents and Republicans.

Why do you think this happened? Is it because the political divide is wider than ever before? Or lack of civility? Is it because people are getting their news from separate universes? Do you share religious or political beliefs? Or do you self-censor?