It is often hard to know which is worst thing my shitty country did to the world, but deepest apologies. And tbh it was fine right up until the mid to late 00s. I was in school around that era and saw the most ridiculous bullshit, and was convinced it was only my meme school doing this and nobody would care. I was horrified to find out it had become society wide. Lots of people blame the Jews but I can't help but wonder if Chinese or some other influence is behind this crap (since I saw two Asian teachers doing these purposefully divisive courses).
The biggest irony is what seemed to happen was after the Christian fundamentalists of the 90s finally lost a lot of their power that these freaks then took up the banner of speech censorship and some kind of bizarre moral authoritarianism. They aren't even leftists at this point. They are a bunch of iShit obsessed, facebook shitposting, freedom and privacy hating, Starbucks sipping authoritarian neoliberal faggots. I also think that any traces of genuine leftism were long since undermined and destroyed awhile ago. People forget COINTELPRO was directly targeted almost exclusively against leftists by the FBI.
So now it has been subverted to the point where no one seems to care how buttfucked the average worker or poor person is so long as McDonald's and Walmart also sell crap with a rainbow flag on it. Even the so-called "Marxists" are mostly like this. They don't give a fuck even about women being oppressed and exploited in shitholes where their product is made.
The other big irony behind this in American politics is that now the average worker is so severely disaffected by liberals that he now votes for what has typically been the rich people's party, the Republicans, if only because they at least pretend to listen to and care about the worker.
Of course, nationalism has become equally as cancerous, with now the absurdity of a bunch of nationalists trying to create some kind of bizarre pan-nationalist global movement to fight globalism (I don't think they even realize what that means; globalism is a term more for world economic Capitalism) and fighting for an alliance of "white nationalism" and uniting white people by...opposing the European Union.