I have been reliably receiving notifications about responses to my responses, and even to responses to my responses to a response, so I gotta wonder why you don't. I'll have to get into it with another anti-vaxer in order to test that it is still happening. Those guys just gotta have the last word.
I even get things that say, "your story has 10 fans," by both email and notification bell, referring to a response, sometimes one that is years old!