Consider looking at social media less and reading more history. The idea that people are recently celebrating cruelty, but did not earlier, is charmingly nostalgic but not exactly historical.
My clearest memory of that period was Al Qaeda flying planes into the twin towers in 2001 followed by the Iraq and Afghanistan invasions. I'm not sure it was a unique time of brotherly love?
It North America, it was better overall; we didn't immediately assume the other person was inhuman because they voted for the other guy. In the US, we are just so fucked.
The rest of the world, at that time? Probably not so great.
What about people celebrating burning women alive back In medieval times?
That's what people doing all the time not just now. Only that the whole world can see a few insane people doing.