I see more people going “humanity sucks” and such just in this year alone and not just on Internet but in real life too.
We have a bad combination of a lot of change happening and never before imagined levels of coverage and information.
The current hypothesis for things like Brexit and Trump is that people are upset that neoliberalism, the current status quo, the mainstream beliefs, doesn't seem to be working. With terrorism on the rise, and economic uncertainty abounding, people want to try something else.
Plus, we still have racial tensions in many parts of the world. Canada's relations to Natives and U.S.'s relations to African-Americans are still strained, for example. As history can attest, racial tensions just don't turn out well.
Mix this together with the ability to learn basically anything happening all around the world at any time, and it looks like things are going to hell.
They aren't.
As much as it may feel like it's not, the world is better than it was two centuries ago, and that was better than it was two centuries ago, and so on and so forth.
Things that make you angry are great for the internet. Controversies draw pageviews. Flamewars draw revenue.
I love KYM, but ever since it moved to more "whatever's popular on the internet", it's relied on this fact:
Things that make you angry and irritated and, in the long run, cynical gets money.
The issues with the internet are present similarly in other forms of media, but to a bit of a lesser extent.
In light of all the sadness and evil you're bombarded with so that they make more money, nobody can blame you or anyone else for feeling cynical.
Has it always been like this or is it only happening now?
I'm not sure myself, but I wouldn't at all be surprised if the internet was just making things worse. Back in the days of "yellow journalism" it was probably similar, but not as bad.
TL;DR remember what you see is an exaggeration of the negative aspects of the world around you. Keep an eye on the things that are actually practical to your life, and what's happening around you, not on the internet. That's not to say you shouldn't read the news or learn about current events and controversies, but rather that those shouldn't dictate how you see the world.