Identity fragmentation in an insecure world A small nitpick; individualism inherently is about the relation between states and citizens. In my view, the type of problems in the OP have more to do with a cultural trend of extreme liberalism, perhaps even nihilism, and the resulting atomization.
The problems named are of course very recognizable.
In the western world, cultural values and a sense of shared history have been under attack for decades. Despite all the criticism no replacement for this has been offered (and all attempts at constructing an artificial sense of common identity have historically failed).
So people young and old are left to figure things out on their own, and predictably they will do so via the internet, which is a problematic medium for various reasons.
Nowhere does the echo chamber effect appear to be so great as on the internet, and as such it has a tendency to amplify trends on an individual and societal level. Moreover, age groups are largely seperated (with older generations not even using the internet), meaning the younger generations grow up without the guidance of older generations.
Young people grow up feeling confused, resentful and isolated, carrying teenage themes into adulthood for which they were offered no solutions. It's all quite understandable, but understanding and wisdom are sparse on the internet, so instead you see all kinds of equally dysfunctional counter-reactions.
The fact that people are starting to make all sorts of strange leaps in attempts to break out of this situation I view only as a symptom of the deeper problem which is a trend of cultural repression, which has clear precedents in history. The communist episodes in the Soviet Union and Maoist China left entire generations lost, and both Russia and China are putting efforts into restoring their links to the past.
At any rate, I don't think any of it is spontaneous. The destruction of culture historically has had the purpose of either pacifying unruly populations (for example repression of Hungarian culture in the Austro-Hungarian Empire) and/or forging a wider sense of unity by destroying subcultures (various communist regimes).
In my view, this isn't a natural human trend, nor is it healthy.