> I think there's a _very_ high chance that Airbnb hosts probably should be held to those same rules or something very similar but less directly aimed at hotels.

I agree. Hosts should do things like not operate in areas where zoning or other ordinances prohibit or require regulatory compliance for this type of activity. If hosts were operating as an actual lodging establishment, the existing legal framework would provide a solution to discrimination issues.

If Marriott tried to put a hotel in the middle of my neighborhood, which is an 2-4 family residential zone, that effort would fail. If you tried to open a conventional B&B, (there was one that operated about 6 blocks away for many years) you would need to meet certain safety standards like having appropriate fire egress (ie. fire escapes, alarms, possibly sprinklers), have appropriate parking, allow neighbors to react and provide perspective, etc.

In the case of that B&B that was in my neighborhood, they had to install fire escapes, and the neighbors requested that a fence be installed to prevent guests from using their lawn as a pathway.