Nope, still fine even then. You do realize that if I rent out a room in my home (say, for a year's lease), I can discriminate on any basis I so choose?

I don't give a shit. You're a piece of human garbage if you discriminate based on skin colour, and you shouldn't be allowed to do it while having your own little hotel in your house.

Getting a roommate is different. You can still be a piece of garbage and discriminate, but that's your business.

Legally, yes. Morally, I'd disagree.

Not if you're in the U. S.

Got a source on that?

https://www.craigslist.org/about/FHA#roommates

Under federal Fair Housing law, the prohibition on discriminatory advertisements applies to all situations except the following:

Shared Housing Exemption -- If you are advertising a shared housing unit, in which tenants will be sharing a bathroom, kitchen, or other common area, you may express a preference based upon sex only. Private Club and Religious Exemptions -- A religious community or private club whose membership is not restricted based upon race, color, or national origin may restrict tenancy only to its members in a property that it owns, and may advertise to that effect. Housing for Older Persons Exemption -- As discussed below, certain complexes for elderly persons are exempt from prohibitions on familial status discrimination, including the prohibitions on discriminatory advertising.