The article says 25% of Americans haven’t discussed any important matters with someone close to them in the last 6 months. Twenty five percent! That’s a huge number, much larger than the number of people in tech.
I almost never discuss anything important with people outside of extremely close and likeminded friends because of the current political climate. I worry about being ostracized/alienated by them for not believing in the same things as them, so it's not at all worth the risk to actually discuss anything meaningful with them if the outcome might be permanently destroying our relationship.
Right, at school, you could say some awful stuff, and someone would tell you "that's awful because <x>", and you'd usually change your mind. Now, even established science is "controversial", and differing opinions aren't exciting, they're somehow personal attacks. What i mean is, opinions seem to have become an important part of their self to people, maybe through social media. I don't mean somebody thinking they're being argumentative/clever/fun when they're just being rude. Some people are socially inept, but that's a too easy cop-out to use in all of these cases, and does nothing to help those people, or show more socially apt people that it's occasionally ok to open up your guard.
Of course, you can't just launch into such topics with new acquaintances, but to a degree the climate makes it hard to go from acquaintance to friend because everything is small talk. At least that's my feeling, which is why a night of drinking seems to be involved at some point when I make new friends.