Individualism is just a polite word for selfishness and a lack of empathy, and it's at the root of many of America's cultural and political problems. We're supposed to be a nation, not 300 million cowboys suffering the indignity of one another's trespass. We can't even fix our basic infrastructure because no one wants to spend their taxes on anything that benefits anyone but themselves. We can't have decent healthcare because it would be "socialist." But we'll shoot each other in the streets because nothing projects individual power more than a loaded gun.
It isn't, though. Individualism also means things like dying your hair green and being generally fun and original. You can say "selfishness" instead, it's a perfectly good word, and there's no reason to worry about being impolite ... unless you're conforming.
There is a way to be a cohesive society without being assholes to each other. The United States somehow managed that before - more or less. I would not blame "individualism" directly, but we ARE in a timeline where a lot of people strive to be the worst versions of themselves.
Sounds like a copout, but I do insist that many of modern ills can be traced directly to the cancer that is social media. Monetizing rage cannot end well.