[ksaj]

If you find a flat that advertises as "pet friendly," does it discriminate against people who don't have a pet? No. But it does mean you probably won't like the place much if you don't like cats and dogs.

It is not uncommon for people to advertise a room in an "Asian household" (for example) and that isn't discriminating against non-Asians. It is suggesting that Asian people would probably be happier there, but it isn't excluding anyone.