Respect the choices and abilities of your fellow man.
You don’t want kids, fine. Don’t tell your friend who does how awful you think they are, unless he asks of course.
You don’t want a wife, fine. Don’t tell your friend thinking of proposing that his future wife will definitely cheat on him and turn into Lucifer in the divorce courts.
The world isn’t full of sociopaths, social media just makes it seem that way (availability heuristic).
Don’t project the worst of modernity onto individuals. We all have a choice. Respect your fellow men and the paths they travel. A pessimist isn’t a realist.