"Individualism" is one of the cursed internet words which will have a different meaning for every person who uses it. Discussions about it tell you more about the community having the discussion than anything about the word. And it can cause arguments when interpretations differ within a single discussion.
The contrast you see between opinions about the word is just a reflection of the general contrast between liberals and leftists.
I'm not saying it's new. "Cursed internet word" was a possibly stupid way to say its use, on the internet, often causes problems, like arguments.