Whether it is possible to proactively mitigate a circumstance has no bearing on whether the circumstance exists. I met plenty of people through sports and work. The Freeze is a local, cultural ambient background of social norms. It's an impression that each person is, more than usual, in their own private world. It's a lack of friendliness. It's strangers never looking at you or saying 'hi' - and there are places in the world where it is normal to look at strangers and say hi when you pass them. People don't say much. When they do they don't emote much, and it tends toward mealy-mouthed politeness. I could theorize about potential factors - off the top of my head I'd guess it's partly due to an unusually high population of affluent introverts. By now, even second-generation affluent introverts (e.g. the grown children of the people who made Windows). It affects me as a constant general background of insularity and alienation. It's quite apart from the issue of whether I've made friends through activities - I've done that. Obviously, nobody is saying that no human being in Seattle ever associates with any other, ever.

It also occurs to me that it's maybe a sort of social tragedy of the commons. There's nothing wrong with being a locksmith, but an entire society of locksmiths would probably run into problems. Likewise, it's not a sin to be introverted, but a party (or a city) where everyone is introverted is going to be missing something, and become very dependent on the presence of Guitar Hero or Settlers of Catan stations for fun.