You know, it's funny. I spent a lot of time thinking about this thread. As I've mentioned a few times before, my entire professional life focuses on detecting and responding to threats like this (and Anonymous is not unknown to me in that context).
But I don't feel hate for these groups. For some of them, derision perhaps ("s'kiddies"). Others, annoyance or irrelevance. A particular few groups, yes, professional fear. And for some groups or individuals, grudging respect.
I'm not sure yet about Anonymous in any detail. But they do fascinate me.