Java has a lot of advantages, but that’s a crazy statement. I feel like literally everyone complains about basic stuff like public static void main, over reliance on factories and OOP, and just how much code you need to generate for some basic stuff. I’m not a Java hater, but I am glad I don’t have to use it anymore.
So a lot of Java hate I think is mostly in jest.
Personally, Java was the programming language that I had to use for my first two years of college. It’s how I learned OOP, data structures, and algorithms. I had to use Eclipse, which at the time was AWFUL (and maybe still is, no idea). I remember it being semi-normal for it to take over a minute to launch on my (gaming) PC.
Later on, as I learned other languages and got a job, I just haven’t really had a reason to go back to Java, and most of my memories of it are from being annoyed at Eclipse and needing to implement Quicksort in it. I’m sure it’s a great language and I bet it’s a lot better and more convenient now. It’s just kinda trendy and weirdly nostalgic to hate on it in a half-serious way :) .