I'd add that I'm not assuming the person I was replying to doesn't do this, just that it's my hunch in a general sense that people basically stick to their circ

I'd add that I'm not assuming the person I was replying to doesn't do this, just that it's my hunch in a general sense that people basically stick to their circles and don't realize how differently people see the world outside it and why, because only the most emotionally charged, opposing, or niche topics make their way across someone's radar unless they speak to those people in real life. People are broadly much more alike than they are different, and the reasons they're different come down to familial, regional, or circumstantial variation that aren't as much of a barrier to forming common bonds as the internet or media would have us believe. That's also not to say that there aren't insurmountable differences like economic class that influence outcomes in a major way.