My personal theory is that people broadly are becoming very thick skinned with regard to content being pushed on them, but at the same time it has not occurred to people to simply disengage. (ie, they're getting frustrated by the pushers, but aren't leaving forums, social media, youtube, etc. so that no one can push anything on them) I think in some of the darker corners of the web, you currently see this associated with the term "slop." I assume we're all familiar with metaphor. Most of our waking lives (assuming we're on normal platforms) someone is out trying to twist your arm to get your attention, to get you outraged or jealous; anything for attention.
I really think it's breeding an incredible amount of unthinking cynicism, and at least some of the negativity you find online is just related to all the different wars for attention. As noted, it's quite surprising just how many people won't step away from this crazy attention marketplace. It's easy to do in principle: Put down your phone, your computer, and read a book or take a walk. In practice, it's more like overeating; people were never built with impulse control against novelty and social outrage, and lacking the fundamentals most people fail this test.