Open-access advocates of all stripes—researchers, librarians, publishers, consultants—are in my experience voracious readers on open access. I fit the profile, but I know people who read even more than I do, approaching "everything."
One practical result of all this reading is that every single one of us—me included—has wanted to read an article on open-access that was published in a journal that we don't have access to. And almost every time, we grumble about the irony.
Here's the thing, though. If we're going to maximize the reach of our message, we're going to have to put up with that particular irony. I don't like that academics have tunnel vision either, but they do—which means publishing in enemy outlets.
Do we need to call it out every time? Only if we care to annoy and antagonize by looking incurably smug. I suggest instead that we mourn our missing access. That, after all, is the actual problem. Irony isn't.