In your and your coworker's situation, and the parent's situation - this may be the case - but I'd argue that it is the exception for most people and most job situations.
It is one of the driving arguments (stated or not) behind the resistance to the concept of "universal basic income" (UBI) and instead the rallying for "more jobs" (speaking from the perspective of the USA here, I don't really know what the situation is like elsewhere - I have feelings that it varies depending on the culture).
I believe that most people do build their lives around their work, and the people at them. They work with these people for a long part of their weekdays; then they go home usually to a family (children, spouse, pets) and may not have much interaction with other people who are friends (maybe a phone chat occasionally - and perhaps the rare get together). They look at their coworkers as their peer and friend group.
Unfortunately, that also brings all the baggage and strife with it such social situations can lead to. It is likely what fosters and aggravates the petty office politics and group dynamics - perhaps part of what leads to worse situations. This all can seem odd to people who are introverts and don't build their lives around their work environment, but it doesn't seem to be the norm.
That's all my opinion, and I could very well be wrong, its just based on what I have seen and experienced over my decades of employment. For what it's worth, I'm fairly introverted myself, but I also try to understand my coworkers (specifically and in the general sense) and their views on work/life, which is why I have come to these conclusions (right or wrong as the case may be, I suppose).
