I'm not certain their point was the anti echo chamber thing. In other words the phony "free speech" thing that means you have to let bigots ply their rhetoric.

Do I think people can go too far and literally only surround themselves with “yes men” socially?

Reddit has serious problems localized extremum. To detach it from politicization take the 3D printing subreddits for example. For a while they were convinced it's the second arrival of Jesus. At one point it was said every household would have this appliance. Like a washing machine or refrigerator. You must conform to the talking points. Cryptocurrency is a recent one. There is no talking like normal people in those subreddits without being faced with scripted rhetoric. Real life isn't like this. In real life people don't talk like stump speeches.