I bet you don't have that type of reaction when it's someone complaining about the state of healers. To some, the complaints about the state of healing is absolute lunacy, too.
Rescue is disliked because it is intrusive and people will complain about it, like it or not, that's called feedback, and having our flow messed with in an intrusive way like that is a very valid thing to complain about to us even if it's "lunacy" or "pearl clutching" to you. It's just bad game design that makes for a very unpleasant experience even if of course from the healer's perspective, it's just whatever.