Earlier quoted context omitted.
I think you're missing the point of the article. It's not that these things don't exist, or didn't exist for her -- of course they do. The point seems, to me at least, to be that in order to attempt to actually solve these problems you can't actively (or passively) try to exclude yourself from the people causing them. It's like politics -- if you separate yourself into "us" versus "them", how are you ever supposed to…
Different and opposing groups work together to find a common solution all the time. You can be different and work in a group and it not be antagonistic. This "us v. them" mentality is fostered by people who don't want to contribute with people who are different, they want everyone to assimilate into "their way." Take the "black lives matter" movement. If we followed the OPs advice, they should just protest that "all…
Modernism (and I'm talking as far back as the early 1900s, and arguably, even earlier than that) has eroded our sense community. Our communication tech has, over the past few centuries, have allowed people to talk to each other at greater physical distance while at the same time, created more emotional distance from each other. While modernism might have produced great advancement in science and technology and challenged traditional dogmas, it also threw out a lot of what we needed from those traditions. Community-building is one of them.
Movements that are trying to raise awareness on problems and change don't always have a clear idea on what happens after the fight is over: can you imagine still living, working, and playing with those people after all is said and done?
Take "Black Lives Matter", or even "All Lives Matter". People voice their deep concerns, the ugly things get aired out. And after all of that, can you see yourself living next door? Your children playing and going to school together? Going to the pub after a town hall meeting? Barbecue at the park on a summer day? Borrow each other's tools? Asking each other for advice? Taking in one of the kids after school because your neighbor is busy that day?
Or do you get a sense of fear, disgust, resentment, contempt, or despair?