Friendly reminder that just because you know you would've been fine doesn't mean everyone else also knows. With the amount of people in DF and sometimes even PF that sleep on mechanics, it's really no wonder some healers just go for Rescue if they think someone might get (almost) killed if they don't intervene. After all, they are the ones who will ultimately have to deal with the consequences.
You can always tell them nicely that you are fine and know the right timing or have selfheals ready afterwards. While I don't like getting pulled out of my rotation either, I can see where they're coming from when they see someone is being really greedy.