But discrimination based on things other than race, gender, etc. is not necessarily illegal, or even wrong. When a company is considering candidates it discrim

But discrimination based on things other than race, gender, etc. is not necessarily illegal, or even wrong. When a company is considering candidates it discriminates based on skill, experience, demeanor (and the vague "culture fit", which is indeed worthy of criticism as a criterion). With AirBnB, the renter applies, and the owner has the [now quickly eroding] right to refuse. Basing that on things other than immutable characteristics is not necessarily wrong.