Earlier quoted context omitted.
Is your position that it should be illegal to use a criterion in ad targeting if the use of this criterion results in an ad being seen by one arm of a protected category more than another arm? That's a consistent position, but it amounts to banning of ad targeting. Is that the world you want?
The law explicitly says you can’t discriminate housing ads against certain groups. Courts have held that Things that aren’t illegal on their face can be illegal if they have highly discriminatory effect in practice. So I don’t see why any of that should be allowed here. And it would only apply to things that have a heavy discriminatory effect. I don’t see why it would matter if you chose not to advertise your non-pet…
As a matter of fact, pet ownership is a strong proxy for a protected class [1].
Is your position that an apartment building owner should have to advertise to pet owners and non pet owners equally even if the apartment complex doesn't allow pets?
Come to think of it, isn't having a no-pets policy itself discriminatory?
[1] https://www.statista.com/statistics/250858/dog-or-cat-owners...