The artist doesn't get to choose how people react to their art.
C.S. Lewis takes on the issue of subjectivism in his book "The Abolition of Man". He takes a pretty close look at the ethical repercussions of moral subjectivity. It's a fairly quick read and I think it's even available online because it's out of copyright.
It's not by any means a direct rebuttal of your comment, but right at the beginning of the book I think there's an example that's germane to this current conversation. You may find it interesting.
After skimming a few pages, I don't read it as a critique against all subjectivism -- more of a critique of simple subjectivism. Lewis holds up some books as examples of "true" art, and so holds his subjective view as superior to the schoolbook example he disparages. Just as there is crap art, there is crap critique.
Sure, but that's irrelevant, isn't it? The artist doesn't get to choose how people react to their art.