This is a load of gilded age nonsense. There's never been any point in history where people deliberately exposed themselves to uncomfortable truths about people they considered other as part of "growing up".
I'd really challenge you to think about when you think this was. Was it in the 80s while gay people were dying of aids while straight people ignored their plight?
The 70s when mainstream american society treated anti-war activists as terrorists?
The 50s and 60s when white people literally moved out of cities and into suburbs to get away from black people?
What you're experiencing isn't "people failing to communicate with people with diverse views," but the internet finally forcing people to coexist with social groups they could just ignore until now. You have to exist on the same site as people who have been deeply harmed by the systems that benefit you and you're scared of that anger and those people's unwillingness to accept your desire to stick your head in the sand like your parents could.