Sounds like that boss took the whole being professional to an extreme level. I do understand why some people may not want to discuss things that involve non-work activities or other things in their lives. I'll be honest, I'm sort of like that myself since I believe no one truly cares or wants to hear. But engaging in small talk to relieve some awkwardness and create a more balanced environment is key to a more positive work environment.

One thing I've observed is that people are more willing to talk about the happy stuff that is happening in their lives. Like weddings, graduations, other special events. It's when things get bad when people tend to clam up and say they are just going through personal issues. I'm more like that as well. In the rare times I do open up, I'm more willing to talk about the good stuff and hide the bad. I even keep funerals to myself. Keeping things completely work related can create awkwardness, which seems to be the case at your previous job.