> The homeowner's use of Airbnb is more analogous to listing in the "newspaper classifieds" rather than contracting a human broker.
Unlike discrimination by hosts against renters, discrimination by renters against hosts doesn't seem to be a violation of the fair housing laws of either the United States or any State, so, at least in the US, is less likely to be a legal compliance issue to which their may be liability attached.
Some guests may avoid to stay with hosts of certain life styles, gender, race or religion. This discrimination must be stopped.