Regardless of where you stand on the issue, there is no analogue in traditional (read: newspaper) advertising.
If you take out an advertisement in a Catholic newspaper, you're focusing on Catholics. But non-Catholics may still read your advertisement if they come upon your newspaper. There is no method in traditional physical media to specifically exclude any demographic; there are only ways to emphasize one demographic over another. This makes digital advertising with demographic-based exclusion (rather than demographic-based inclusion) incomparable to a newspaper.
That difference may seem hollow but it is a difference of category, rather than degree. More important than this point is the observation that these kinds of debates quickly devolve into litigating the appropriateness of imperfect analogies rather than the original issue itself.
